Kotlin GitHub Repositories (2026) · Open Source Tools

Folio Launcher: a clean, iPhone-style (iOS) Home Screen for Android foldables like the Galaxy Z Fold, with jailbreak-inspired tweaks. Free, open source, no root.

iPhone-Duo frosted-glass fold effect for Android foldables, driven by the real hinge angle. No root.

🦞 Compose Multiplatform image cropper for Android, iOS, desktop, and the web.

Android companion for Markdown vaults stored on GitHub, with Obsidian rendering, offline reading, conflict-safe editing, and an optional desktop sync helper.

The Windows themed keyboard for Android with Windows 98, XP, Vista and Windows Phone 8.1 themes. No trackers, no network, typing stays on the phone.

Focus: a text-only, black and white minimalist launcher for Android. App timers that lock distracting apps, a weekly screen time review, no internet permission.

An autonomous, always-on agent on your Android phone. It has its own browser, keeps a wiki memory of you, and hands the heavy jobs to your own machines. Free and open source, and you bring the model.

A desktop editor for Microsoft Word (.docx) document metadata.

Native Android TV client for Jellyfin. Kotlin/Compose over a Rust core, Direct Play first.

Server-driven in-world UI and application framework for Minecraft Paper servers.

Apple Music-inspired offline music player for Android — local library, no account, no ads

Hand-drawn Compose Multiplatform components for Android, iOS, desktop and WebAssembly.

Sane defaults, pro-level control. An Android video player powered by mpv and libmpv.

RikkaHub Agent · Pure — an Android AI agent that survives long runs. Independent hardening pass on the rikkahub on-device agent: usage ledger & budgets, on-demand tools, expert sub-agents, cold memory, chained workflows. Kotlin/Compose, Shizuku/Termux/MCP. QQ group 1030362371.

A modern network client for android.

Private OpenPGP for Android. Hardware security keys, password-store, no tracking. Open source.

Scribe-Android: Keyboards for language learners & Conjugate-Android: Wikidata based verb conjugation app

Open-source roguelike shooter for Android. Simple controls, no ads, no tracking, no internet permission. Free forever under GPLv3.

Secure Reliable Transport (SRT) Protocol for Android

Enable users to store their expense & incomes and keep track of their finances.