Open source Android, iOS and Web app for learning about and managing digital and physical security. From how to send a secure message to dealing with a kidnap. Umbrella has best practice guides in over 40 topics in multiple languages. Used daily by people working in high risk countries - journalists, activists, diplomats, business travelers etc.

opensource
security
risk
human-rights-defenders

marius-h /flutter_enhancement_suite

Kotlin29035

The essential IntelliJ/Android Studio plugin for making working with Flutter easier than ever!

flutter
dart
intellij-plugin
androidstudio-plugin

daryan044 /tessera-linux

Kotlin2459

Run Linux desktop apps on Android as native-looking apps: Debian and Flathub, GPU acceleration, a desktop mode, PRoot or chroot, Material You theming.

kakao /actionbase

Kotlin23019

One database for user-user (follows), user-item (likes), and item-item (related items) interactions — precomputed at write time, served as simple lookups

database
low-latency
real-time
graphdb

the-geeky-couldron /waypoint

Kotlin2289

Real streets. Game worlds. Native Android navigation with 27 game-inspired maps, sensor-assisted guidance and verified in-app updates.

kotlin
navigation
android-app
android-auto

Koustubh12345 /YTXTube

Kotlin22518

YTXTube: A lightweight YouTube and YouTube Music client with ad-free playback, synced lyrics, and high-quality downloads for Android phones, tablets, and TV.

iamjosephmj /flinger

Kotlin2029

Customizable Fling Physics for Jetpack Compose. Take full control of scroll momentum in LazyColumn, LazyRow, Pagers, and more with 9+ presets, snap behavior, and adaptive physics.

levhakobyan /OpenTV-Remote

Kotlin18913

Free, open-source smart TV remote for Android and iPhone. Custom layouts, local Wi-Fi control, and English/Russian interfaces. MIT licensed.

xlollx /Trackhop

Kotlin1655

Free, open-source playlist sync for Android, Windows, macOS, Linux and Docker. Keeps playlists identical across Spotify, YouTube Music, Apple Music, Amazon Music, TIDAL, Deezer, LiveOne, Anghami, Navidrome, Jellyfin and Plex. Scheduled syncs, easy review of tracks not found. No Trackhop account or server: everything stays on your devices.

alternative
amazon-music
android
f-droid

JulioFerrero /pocket-foundry

Kotlin1608

Play your own copy of Factorio on Android: the official Linux ARM64 build, run without emulation on the phone's GPU, with an on-screen controller.

adreno
android
factorio
linux-arm64

kohesive /kovert

Kotlin15810

The invisible REST and web framework

CluvexStudio /Strata

Kotlin15510

An open-source file manager for Android: two panes, archives, APK and DEX editing, a code editor, network storages and an encrypted vault. No ads, no accounts, no tracking.

7zip
android
android-file-manager
apk

exigow /intellij-gdscript

Kotlin14810

Godot Engine and GDScript support plugin for IntelliJ based IDEs

Longi94 /JavaSteam

Kotlin14648

Java library that provides an interface to directly interact with Valve's Steam servers.

steam
valve
java
steamkit2

kotlin-graphics /vkk

Kotlin1426

VK², Kotlin Wrapper for Vulkan: code expressiveness and safety meet graphic power

vulkan
vulkan-library
vulkan-utils
vulkan-sdk

samlu /CamMonitor

Kotlin13523

CamMonitor turns your spare Android phone into a private, zero-account home security camera. Connect two Android devices directly using peer-to-peer (P2P) encryption over Wi-Fi or cellular networks without cloud subscriptions, login accounts, or third-party servers storing your video.

0xProbabillity /house-control-android

Kotlin13110

House Control on Android phones and tablets: your home as a live 3D model — lights, ACs and scenes via Smart Life, Home Assistant and Philips Hue. No Mac needed.