Open source. Open possibilities.

AuraMusic is a cross-platform YouTube Music client for Android and desktops, featuring Nothing OS themes, Automix DJ transitions, Android Auto lyrics, and AI diagnostics.

sqlc generates type-safe code from SQL queries, supporting multiple languages via plugins. It compiles SQL to idiomatic code, reducing boilerplate and errors.

YTDLnis is a free, open-source Android audio/video downloader built on yt-dlp, supporting 1000+ websites, playlists, scheduling, custom commands, cookies, subtitle/metadata embedding, SponsorBlock removal, and plugin-based runtime management.

Simple Multi Apps - Kotlin is an open-source Android application featuring a modular collection of tools including a stopwatch, games, PDF reader, and video player.

Exposed is a lightweight Kotlin SQL framework and ORM providing a typesafe DSL and DAO API for relational database access, supporting JDBC and R2DBC drivers across multiple database engines.

A highly customizable calendar library for Android and Compose Multiplatform, providing the logic for date displays while allowing developers to define the UI.

A web tool that visualizes a GitHub user's profile and activity as charts and statistics, with a hosted demo and self-hosting instructions.

Gatling is an open‑source load‑testing platform that lets you write performance tests as code in Java, JavaScript/TypeScript, Kotlin or Scala. It uses a non‑blocking, asynchronous engine for high scalability, supports HTTP, WebSocket, SSE, JMS, gRPC and MQTT, and integrates with CI/CD pipelines, APM tools and observability platforms.

Antares is an open-source digital circuit learning platform written in Kotlin. It provides tools to design and simulate digital circuits with embedded explanations, featuring a Swing-based desktop application.

An AI-first engineering toolkit that provides specialized knowledge, workflows, and standards to turn AI coding agents into senior mobile engineers.

Free index of Chinese programming books covering operating systems, AI, Web, algorithms, and various programming languages, with community contributions.

VeloTrack is a free, MIT-licensed Android app for offline GPS cycling maps and ride recording, built with MapLibre and Protomaps — downloadable maps, GPX export, no accounts or analytics.

filepicker is a high-performance, all-in-one file picker library for Android. It blends WeChat and Douyin visual styles, implements smooth slide multi-select gestures like Huawei Gallery, supports images, videos, audio, documents, APK, archives, and offers customizable filtering and UI configuration.

Official Kotlin repository: JetBrains' concise multiplatform programming language, with compiler, standard library, Gradle build automation, Kotlin/Native support, and contributor guidelines.

LeakCanary is an open-source memory leak detection library for Android, maintained by Square. It helps developers find and diagnose memory leaks in Android apps, with documentation hosted at square.github.io/leakcanary.

A personal repository collecting coding challenges and exercises for learning various programming languages, frameworks, tools, architectures, and design patterns. Not intended as a teaching resource but as a personal learning portfolio.

Keep is an Android app for FROST threshold signing of Nostr events, implementing NIP-55 and NIP-46 so keys are split across shares and never held whole on one device.

OpenLoop is an open-source Android camera app for creating speed-controlled video loops (boomerangs), featuring live face lenses and a photo booth mode with 100% on-device processing.

Bitwarden's official Android client for its password manager and authenticator, built with Kotlin and Jetpack Compose, supporting phones and tablets on Android 10 and up.

A minimalistic Android note-taking app built as a learning playground for modern Android development practices including MVVM, Kotlin Coroutines, Room, and Material Design 3.