Messaging
571 open source Messaging apps
JioFi Battery Notifier
APK
This is a very small android app with only one purpose. Show percentage notification of battery for JioFi device which is used for access internet with Jio Sim. App will send alerts and notifications on Low battery and Full Battery. You can customize these options in the app. Refresh interval - How fast you want to check the battery percentage. Low Battery Level - After what level app should you notify that battery is low and you should connect a charger. Low Battery Alerts - Should app send alerts or only display notification. Alert Sound - Should app play sound with alerts. Alert Vibrate - Should app play vibration with alerts. JioFi Panel - Access JioFi Panel from the app.
F-DroidGitHub
Jitsi Meet
APK
Jitsi Meet lets you stay in touch with all your teams, be they family, friends, or colleagues. Instant video conferences, efficiently adapting to your scale. * Unlimited users: There are no artificial restrictions on the number of users or conference participants. Server power and bandwidth are the only limiting factors. * No account needed. * Lock-protected rooms: Control the access to your conferences with a password. * Encrypted by default. * High quality: Audio and video are delivered with the clarity and richness of Opus and VP8. * Web browser ready: No downloads are required of your friends to join the conversation. Jitsi Meet works directly within their browsers as well. Simply share your conference URL with others to get started. * 100% open source: Powered by awesome communities from all over the world. And your friends at 8x8. * Invite by pretty URLs: You can meet at the easy to remember https://MySite.com/OurConf of your choice instead of joining the hard to remember rooms with seemingly random sequences of numbers and letters in their names.
F-DroidGitHub
KUKSA Companion App
APK
The KUKSA Companion App demonstrates the capabilities of the Android SDK to connect to a vehicle with an integrated KUKSA Databroker, read data and interact with the actuators of the vehicle. The KUKSA framework is based on the COVESA Vehicle Signal Specification (VSS). The VSS defines the names and semantics of a large set of data entries that represent the current and/or intended state of a vehicle's sensors and actuators organized in a tree-like structure. For example, the vehicle's current speed is represented by the Vehicle.Speed entry. However, VSS does not define how these signals are to be collected and managed within a vehicle, nor does it prescribe how other components in the vehicle can read or write signal values from and to the tree. The KUKSA Databroker is a resource efficient implementation of the VSS signal tree and is intended to be run within a vehicle on a microprocessor based platform. It allows applications in the vehicle to interact with the vehicle's sensors and actuators using a uniform, high level gRPC API for querying signals, updating current and target values of sensors and actuators and getting notified about changes to signals of interest. Showcases covered by the Companion App are: - Door Control - Temperature Control - Light Control - Tire Pressure Check Find out more about KUKSA: - Vehicle Signal Specification: https://covesa.github.io/vehicle_signal_specification/ - KUKSA Databroker: https://github.com/eclipse/kuksa.val/ - KUKSA Android SDK: https://github.com/eclipse-kuksa/kuksa-android-sdk/ - KUKSA Companion App: https://github.com/eclipse-kuksa/kuksa-android-companion/
F-DroidGitHub
Kaiteki
APK
Kaiteki is a cross-platform client for social networking sites. It currently supports Mastodon, Pleroma, Misskey and Twitter. Future backends could follow.
GitHubIzzyOnDroid
KeePass NFC
APK
For use with https://f-droid.org/packages/com.android.keepass. KeePass NFC lets you use a rewritable NFC tag to unlock your KeePassDroid database. It includes the functionality to write the NFC tag as well as to unlock KeePassDroid when reading the tag.
F-DroidGitHub
Keep Alive
APK
Keep Alive will send a custom message via SMS to one or more people if you haven't used your device in a given period of time. Intended to be used as a failsafe for those living alone in case of an accident or other emergency. Once the settings are configured, no further interaction is required. - 100% Device-based, no cloud services or accounts required - Free with no ads or trackers - Open Source (https://github.com/keepalivedev/KeepAlive) - Minimal Battery Usage - Multiple SMS Recipients - Custom Alert Message - Optional: Include Location Information in SMS - Optional: Place a phone call with speakerphone enabled - Optional: Send an HTTP request to a custom URL Requirements Keep Alive requires that your device has an active cellular plan. WiFi calling and messaging will be used if the device supports it. How it Works Keep Alive uses either your device's lock screen or another app(s) to detect activity. If your device hasn't been lock or unlocked for a set period of time, or if you haven't accessed the selected app(s), you will be prompted with an 'Are you there?' notification. If this notification is not acknowledged an Alert will be triggered. Based on the configured Emergency Contact Settings, one or more SMS messages and/or a phone call will be placed to notify others that you may be in need of assistance. WARNING: If your device restarts, Keep Alive will not be able to check for recent activity until the screen is unlocked. On Android 7.0+, Keep Alive can still send an alert before the screen is unlocked but must assume you have been inactive based on its last saved state. On older Android versions, Keep Alive cannot run at all until the screen is unlocked and alerts will not be sent. Main Settings - Monitoring Method - Choose between using the lock screen or another app(s) to detect activity. If using another app(s), you will be prompted to select the app(s) to monitor. - Hours of Inactivity Before Prompt - how many hours since your phone was last locked or unlocked before you are prompted with an 'Are you there?' notification. Defaults to 12 hours - Minutes to Wait - if the prompt is not acknowledged within this time, an Alert will be sent based on the configured emergency contact settings. Defaults to 60 minutes - Rest Period Time Range - a range of time during which inactivity will not be counted. For example, with 'Hours of Inactivity' set at 6 hours and a Rest Period of 22:00 – 6:00, if the device is last used at 18:00, the 'Are you there?' check would not be sent until 8:00. Note that an alert can still be sent during a rest period if the 'Are you there?' check was sent BEFORE the start of a rest period. - Auto-Restart Monitoring After Alert - If enabled, monitoring will be automatically restarted after an Alert is sent. - Alert Webhook - Configure an HTTP request to be sent when an Alert is triggered Emergency Contact Settings - Phone Call Number (Optional) - when an Alert is triggered a phone call will be placed to this number with speakerphone enabled One or more SMS recipients can be configured with: - Phone Number - the phone number to send the Alert SMS to - Alert Message - the message that will be sent when an Alert is triggered - Include Location - if enabled, your location will be included in a second SMS Privacy/Data Collection No data is collected other than the configured settings and nothing is shared with the developers or any 3rd parties. The only data transmitted is to the configured emergency contacts. Disclaimer - Not responsible for SMS or phone call charges incurred by the use of the Keep Alive app - The operation of the Keep Alive app is dependent on the device, software, and network connectivity. The developers are not responsible for any failure due to device malfunctions, software incompatibilities, or network issues.
F-DroidGitHub
Keep Alive Lite
APK
Keep Alive will send a custom message via SMS to one or more people if you haven't used your device in a given period of time. Intended to be used as a failsafe for those living alone in case of an accident or other emergency. Once the settings are configured, no further interaction is required. - 100% Device-based, no cloud services or accounts required - Free with no ads or trackers - Open Source (https://github.com/keepalivedev/KeepAlive) - Minimal Battery Usage - Multiple SMS Recipients - Custom Alert Message - Optional: Include Location Information in SMS - Optional: Place a phone call with speakerphone enabled - Optional: Send an HTTP request to a custom URL Requirements Keep Alive requires that your device has an active cellular plan. WiFi calling and messaging will be used if the device supports it. How it Works Keep Alive uses either your device's lock screen or another app(s) to detect activity. If your device hasn't been lock or unlocked for a set period of time, or if you haven't accessed the selected app(s), you will be prompted with an 'Are you there?' notification. If this notification is not acknowledged an Alert will be triggered. Based on the configured Emergency Contact Settings, one or more SMS messages and/or a phone call will be placed to notify others that you may be in need of assistance. WARNING: If your device restarts, Keep Alive will not be able to check for recent activity until the screen is unlocked. On Android 7.0+, Keep Alive can still send an alert before the screen is unlocked but must assume you have been inactive based on its last saved state. On older Android versions, Keep Alive cannot run at all until the screen is unlocked and alerts will not be sent. Main Settings - Monitoring Method - Choose between using the lock screen or another app(s) to detect activity. If using another app(s), you will be prompted to select the app(s) to monitor. - Hours of Inactivity Before Prompt - how many hours since your phone was last locked or unlocked before you are prompted with an 'Are you there?' notification. Defaults to 12 hours - Minutes to Wait - if the prompt is not acknowledged within this time, an Alert will be sent based on the configured emergency contact settings. Defaults to 60 minutes - Rest Period Time Range - a range of time during which inactivity will not be counted. For example, with 'Hours of Inactivity' set at 6 hours and a Rest Period of 22:00 – 6:00, if the device is last used at 18:00, the 'Are you there?' check would not be sent until 8:00. Note that an alert can still be sent during a rest period if the 'Are you there?' check was sent BEFORE the start of a rest period. - Auto-Restart Monitoring After Alert - If enabled, monitoring will be automatically restarted after an Alert is sent. - Alert Webhook - Configure an HTTP request to be sent when an Alert is triggered Emergency Contact Settings - Phone Call Number (Optional) - when an Alert is triggered a phone call will be placed to this number with speakerphone enabled One or more SMS recipients can be configured with: - Phone Number - the phone number to send the Alert SMS to - Alert Message - the message that will be sent when an Alert is triggered - Include Location - if enabled, your location will be included in a second SMS Privacy/Data Collection No data is collected other than the configured settings and nothing is shared with the developers or any 3rd parties. The only data transmitted is to the configured emergency contacts. Disclaimer - Not responsible for SMS or phone call charges incurred by the use of the Keep Alive app - The operation of the Keep Alive app is dependent on the device, software, and network connectivity. The developers are not responsible for any failure due to device malfunctions, software incompatibilities, or network issues.
F-DroidGitHub
Keep it up
APK
Keep it up checks the availability and reachability of network services via Ping, TCP Connect, HTTP/HTTPS Download, and SNMP periodically. Each check is logged with its result and duration, and notifications can be sent on failure or on status changes. Features - Create multiple independent network tasks, each monitoring one network service at a configurable interval - Supported types: Ping, TCP Connect, HTTP/HTTPS Download, SNMP (v1/v2c) - A can perform multiple attempts per execution. All results are logged including duration - SNMP queries the system group at each interval and supports per-interface monitoring with alerting on status changes - Downloaded files can automatically be deleted after a successful download or be kept - Notifications on failure, or when a service goes down or comes back up - Tasks can be restricted to WiFi connections to avoid unnecessary mobile data usage - Configurable suspension intervals for battery saving - Configuration can be exported and imported as JSON Permissions - RECEIVE_BOOT_COMPLETED for restarting running networks tasks on device boot - ACCESS_NETWORK_STATE for checking network accessibility - INTERNET for accessing the internet - WAKE_LOCK to keep the device awake while executing a task - FOREGROUND_SERVICE to start the foreground service for running tasks - FOREGROUND_SERVICE_DATA_SYNC to use the foreground for task scheduling - FOREGROUND_SERVICE_SPECIAL_USE to use the foreground for task scheduling (Android 14+) - USE_EXACT_ALARM to start networks tasks after expiry of intervals (Android 13+) - SCHEDULE_EXACT_ALARM to start networks tasks after expiry of intervals (Android 11 and 12) - POST_NOTIFICATIONS for sending notifications
F-DroidGitHub
Klaxon
APK
Klaxon is a tool designed for on-call personnel, that repeatedly notifies the user (by means of a ringtone, vibration or both) when a page is received until the user looks at it. A page to Klaxon is an SMS message, optionally meeting filtering criteria set by the user.
F-Droid
Koler
APK
Koler’s ongoing call UI makes everything easier. Its uses swipes and minimalistic design, making everything more beautiful, intuitive, yet still productive. In an incoming call, you can do the following before answering: * Reject and send the call a SMS * Reject in a specified amount of seconds * Answer in a specified amount of seconds In an ongoing call you can: * Reject in a specified amount of seconds The app’s main goal is to be more intuitive and comfortable, For that reason, the swipes are the main way of controlling the app, making it much smoother to use. Dialer: * Call - Swipe up * Delete number - Swipe left * Collapse dialer - Swipe on the contacts list Incoming Call: * Open keypad - Swipe up * Reject/End - Swipe left * Answer - Swipe right * Send sms - Swipe up on the send SMS overlay
F-DroidGitHub
KouChat
APK
Chat and transfer files with others on your WiFi network. KouChat is a serverless LAN chat application for the desktop and Android. With KouChat you can chat and send files to other KouChat users on the same local area network. It's intended to be used on your wireless network at home, the coffee shop, work place or similar, and does not require any setup, Internet connection or servers to function. See our user guide for more information about how to use KouChat. Notes: * KouChat does not see users across the Internet or the cellular network. * Some devices have unreliable network when the screen is off. * Not all networks have multicast enabled, which is a technology required for KouChat to work. * See at the bottom for tips if you are having problems. Features: * Group chat with all the connected users * Private chat with any user * Choose your own nick name * Set the topic of the group chat * Rich notifications * See who is currently writing * Send and receive files * Use away mode when you don't want to be disturbed * Choose the color to use for your own messages, and info messages * Send messages in any language supported by Unicode.
F-DroidGitHub
L
LG
APK
You can control the LG TVs with your device's infrared sensor.
F-Droid
LINE
APK
New communication app which allows you to make FREE voice calls and send FREE messages whenever and wherever you are, 24 hours a day!
Direct
Launch Chat
APK
Features * Avoid granting WhatsApp, Signal and Telegram access to your contacts * Start a one-off conversation with a phone number without cluttering up your contacts * Click on a phone number in any app or website and share it with "Launch Chat" to start a WhatsApp/Signal/Telegram conversation.
F-DroidGitHub
Lemmy Redirect
APK
Lemmy Redirect is a simple app for automatically launching fediverse links in your preferred Lemmy client. Currently, most domains from the Lemmy Explorer are supported.Lemmy Redirect supports most active and alive instances, but excludes dead instances and instances that haven't had any activity recently. This is to keep the list as short as possible and avoid crashes.Lemmy Redirect currently supports the following clients:EternityJerboaLiftoffSummitSyncThunderAnd the following auto-discovery clients:RaccoonOnce you download the app, you can choose your client app and then enable all supported domains, so that when you tap a recognized link, it gets passed to Lemmy Redirect.
GitHubIzzyOnDroid
LibreSpeed
APK
Check the speed of your Internet connection. Test servers are provided by Consortium GARR and B2B Risk. Features: * Download and Upload tests * Ping and Jitter test * IP address and ISP detection * Multiple test servers * Share your results
F-DroidGitHub
Lighthouse Power Management
APK
Power management app to control the Valve Index® lighthouses from your phone. When exiting Steam-VR it sometimes happens that the lighthouses won't power down correctly. This app helps address this problem, it allows you to find and connect to your lighthouses and change the power state manually. The app also supports Vive Base stations devices.
F-DroidGitHub
Linphone - open source SIP client
APK
Linphone is an open source app offering free audio/video calls and text messaging. With Linphone, you can be reachable at any time, even if the app is closed, with a WiFi or 3G/4G internet connection. Linphone key features: * high definition audio and video calls * audio conference calls with various participants * pictures and file sharing * Linphone accounts reachable at any time, even if the app is closed (thanks to push notifications) * secure communication (encryption options) * compliant with a large number of SIP-compatible VoIP service providers allowing to reach everyone that has a "classic" phone line. Linphone is available on the main mobile and desktop operating systems and offers various specific features for advanced users (codecs, transport standard, encryption options, DTMF...). For more information, see Linphone project website: www.linphone.org Note for developers and professionals: Linphone can be rebranded and customized to meet specific needs. Contact Belledonne Communications www.belledonne-communications.com for any specific development query.
DirectF-Droid
Little Relay
APK
Transform your Android device into a bidirectional data bridge between Bluetooth Low Energy (BLE) and MQTT broker.
F-DroidGitHub
LocalSend
APK
LocalSend is an open source app to share files and messages between nearby devices using the local wifi network. The communication between devices is entirely end-to-end encrypted via HTTPS. No Internet required. No tracking*. No ads. Currently, this app is available on Android, iOS, macOS, Windows and Linux. You can find all download options on the official homepage. *The operating system may still gather usage data.
F-DroidGitHub
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Locate my device
APK
Locate My Device is an application miming Google's Find My Device – through SMS. It can help you to locate a lost smartphone.How it works? Simply send an SMS to the device you want to locate in order to retrieve information about it. The SMS must consist of the configured activation command, a password and an instruction – e.g. "locate" if you want the coordinates, "battery" for some battery details, "ring" to make it ring – or "lock" to lock it down.
GitHubIzzyOnDroid
L
Location Share
APK
Location Share is a simple Android application that allows you to share your current location. Location Share doesn't require setting up an account, doesn't track your location in the background, doesn't auto-share it, and doesn't send it to anyone except those you explicitly tell it to. It can share your location using any application that supports sharing plain text. This includes (but isn't limited to) sharing via SMS, email, social networks, note taking applications, etc. Simply launch the application and wait until the device homes in on your location. You'll then have the option to view the location on a map, share it, or copy it to the clipboard.
F-DroidGitHub
Logcat to UDP
APK
N.B. This probably won't work on Android 4.1+. Simple tool for android development that sends a log to UDP port or share it via email, bluetooth, etc. Background service is collecting logs and sending them to destination IP and UDP port. You can send logs to desktop computer through home wifi network, or to server with public IP or cname. To listen logs use this python script: https://github.com/Chemik/logcatudp/blob/master/test/listener.py Example: ./listener.py 192.168.1.10 10009 You can also use your desktop syslog server to receive logs.
F-DroidGitHub
Loud Bang
APK
First WSPR client for android that can not only transmit beacon signals using phone's audio output, but also receive and decode beacons using phone's audio input. It can use device's camera flash to trigger yout radio's transmit circuitry, GPS to automaticaly update your GRID location the app transmits, and network to send received packets to wsprnet.org. Most of permissions are not required if those features are disabled in settings (which are disabled by default).
F-DroidGitHub