Open Source C++ Software & Tools

A free, open-source real-time strategy game about ancient civilizations, with single-player, multiplayer, and modding support.

A 2D space exploration, trading, and combat game inspired by the classic Escape Velocity series.

High-performance single-node S3-compatible object storage focused on scale-up performance, built in C++.

A free, open-source kart racing game featuring Tux and friends, with single-player, multiplayer, and online modes.

A truly independent web browser built from scratch, with no Chromium, WebKit, or Gecko code.

Powerful Linux and Windows screencast creator with multi-source audio, webcam, magnifier, and countdown.

Free offline maps app for travelers, hikers, and cyclists using OpenStreetMap data. No ads, no tracking.

Free, open source turn-based strategy game set in a high-fantasy world, with single-player campaigns and online multiplayer.

Open-source Bloomberg-style finance terminal built in C++20/Qt6 with embedded Python, AI agents, and 100+ data connectors.

Open source network backup and recovery for mixed IT environments with disk, tape, and S3 storage, a web UI, and multi-OS clients.

A powerful free and open source office suite with word processing, spreadsheets, presentations, and more.

A free, open-source engine and community project recreating Age of Empires II with a modern C++ and Python codebase.

Open-source product analytics with session recording, feature flags, and A/B testing — self-hostable. Replaces Google Analytics, Mixpanel, and Amplitude.

Low-latency, open-source voice chat built for gaming — self-host your own server with no subscription required.

A community-led fork of Organic Maps. Free offline maps for Android and iOS with no ads, no tracking, and no data collection.

Free, open-source desktop video editor for Linux, Windows, and macOS built with Qt 6 and FFmpeg.

Self-hosted image sharing app that ships as a single static binary with multi-user support and shareable guest albums.

An open-source reimplementation of RollerCoaster Tycoon 2 that expands the original with new features, rides, and multiplayer.

Lightweight, free PDF, eBook, and comic reader for Windows that launches instantly and stays out of the way; multi-format support with minimal interface.

Cross-platform PDF viewer focused on textbooks and research papers with smart navigation, marks, bookmarks, and bibliography jumping.

Free, open-source screen recorder and video editor with polished demos, captions, zooms, and local AI editing.

KeePassXC is a cross-platform, community-driven port of KeePass Password Safe. Store credentials locally in an encrypted database, with no cloud required and full data control.

A deep, turn-based open-world survival game set in a post-apocalyptic world ravaged by zombies and catastrophe.

A free, open-source real-time strategy game inspired by The Settlers, focused on building economies and thriving settlements.

OBS Studio is free and open source software for live streaming and screen recording. Capture, mix, and broadcast video with pro-grade tools used by streamers and creators worldwide.