Best Android Open Source Software

Open-source password manager with a generous free tier.

Privacy-focused VPN from the makers of Proton Mail.

Private, end-to-end encrypted messaging.

Cross-platform password manager compatible with Keepass 2.x

Secure, Simple and Scalable Video Conferences

Free and open-source media player

A decentralized, end-to-end encrypted messenger that needs no phone number or email to use.

Free, distributed, encrypted messaging protocol with no central servers and no ads, ever.

Cross‑platform C# framework for 2D/3D game development

Multi-platform 2D and 3D game engine

End-to-end encrypted cloud storage with a zero-knowledge architecture.

Secure online office suite fully compatible with MS Office formats

Open-source, auto-discovering network monitoring platform for switches, routers, and servers.

A fast, private, and secure web browser that blocks trackers by default.

A privacy-focused web browser built on the source code of Firefox.

Defend yourself against tracking, surveillance, and censorship online.

Open-source Linux server management panel for Docker, websites, databases, and AI agent deployment.

Open‑source, multi‑format ebook reader for Android, Mac and Linux

Fast, simple, and modern VPN for secure networking

Open-source framework for building native iOS and Android apps in JavaScript or TypeScript.

A free, secure notes app with audited end-to-end encryption and cross-platform sync.

Open-source team chat organized around topic threads

Cross-platform, customizable ML solutions for live and streaming media

End-to-end encrypted, ad-free email with quantum-safe cryptography.