Kotlin GitHub Repositories (2026) · Open Source Tools

Some helper functions and shared resources used by the Fossify apps.

Reactor Kotlin Support

Tinder for your positive thoughts.

A music player for Android, Desktop and Web with cloud support.

How to write Gradle plugins - answers to common questions and alternative implementation solutions

Music player for Android with optional cloud sync. This repository holds the source of the Offline version.

Launch your Kotlin / KMP app automatically on system startup ✨

Video / audio player for Compose Multiplatform.

A growing library of assorted data structures, algorithms and utilities for OPENRNDR

Android application written in Kotlin with the sole purpose of completely automating a run of Uma Musume Pretty Derby.

Kotlin Multiplatform library that generates JSON Schemas from your methods and classes both at compile-time via Kotlin Symbol Processing(KSP) and at runtime via reflection or kotlinx.serialization.

🌻 The Open Source app Petals aims to help its users to either quit weed, reduce usage or simply know how much they're using.

Native Android client for Music Assistant, focused on music exploration and discovery: Follow Me room detection with BLE fingerprints, a local recommendation engine (Smart Mix, Genre Radio) with MusicBrainz genres, similar artists, Sendspin phone-as-speaker, Android Auto and Android TV.

Ensure your password safety by scanning in data breaches.

Starlasu - A Language Engineering Framework

A Kotlin Multi-Platform ecosystem for symbolic AI

Application configuration / properties loading for JVM applications

🔙 Tapmoc helps with your backward compat

Local-first, open-source Android automation with readable rules, honest permission gates, and no account or cloud runtime.

Native Android media downloader for VRKA with direct extraction and browser-assisted stream discovery.