Tech stack
20 projects use C.
Inference engine that runs LLMs on almost any hardware
llama.cpp is the layer most local model tooling is built on. It is a C and C++ inference engine with no Python runtime, aggressive quantisation support, and hand-tuned kernels for a remarkably wide range of hardware.
Free 2D and 3D game engine with no royalties
Godot ships a complete engine, editor, and export pipeline under the MIT licence, which means no royalties, no revenue thresholds, and no licensing conversation before a project starts.
Hyperextensible Vim-based text editor
Neovim is a hyperextensible Vim-based text editor with built-in Lua scripting and remote-plugin APIs, maintained by its community without a corporate owner.
Real-time infrastructure monitoring with per-second metrics and alerts
Netdata is a self-hosted monitoring agent that collects per-second metrics from systems, containers, and applications, with built-in dashboards, alerts, and anomaly detection.
Free open-source software for live streaming and screen recording
OBS Studio is free and open-source software for live streaming and video recording, mixing scenes and sources on Windows, Mac, and Linux.
Speech recognition that runs anywhere, with no runtime
whisper.cpp is a C and C++ port of the Whisper speech recognition model with no Python dependency, quantised weights, and hardware acceleration across Apple Silicon, CUDA, and plain CPU.
Free open source screen capture and file sharing tool for Windows
ShareX is a free and open source screenshot, screen recording, and file sharing tool for Windows with annotation, OCR, and custom upload destinations.
Cross-platform, fast, feature-rich, GPU-based terminal emulator
Kitty is a free, open source, GPU-based terminal emulator for Linux and macOS that combines fast rendering with tabs, windows, and multiple layouts in a single app.
Password manager you can self-host or run in the cloud
Bitwarden is a password manager with browser, desktop, mobile, and command-line clients backed by a vault you can run on your own server or leave hosted at bitwarden.com.
Self-hosted open-source VPN with TLS security and managed cloud options
OpenVPN is an open-source virtual private network that builds encrypted TLS tunnels between devices and private networks.
Free C# framework for cross-platform 2D and 3D games
MonoGame is a free, open-source .NET framework for building desktop, console, and mobile games in C#, re-implementing the discontinued Microsoft XNA API as code-first building blocks with no scene editor.
Free raster image editor for retouching and composition
GIMP is a free raster graphics editor for photo retouching, image composition, and image authoring on Linux, macOS, and Windows.
Modern game engine on Valve Source 2 with C# and live hotload
s&box is a modern game engine built on Valve's Source 2 and .NET that creates games in C# with millisecond hotload and a Unity-like scene system.
Self-hosted monitoring for networks, servers, and cloud
Zabbix is a self-hosted monitoring platform that tracks networks, servers, virtual machines, and cloud services from one distributed setup, with agents and agentless checks feeding dashboards, alerting, and escalation under a free AGPL license.
Open-source host, service, and network monitoring with plugins and alerts
Nagios Core is an open-source host, service, and network monitoring program that runs checks through plugins and sends alerts when problems occur.
Open-source feature flags with experimentation for self-hosted teams
FeatBit is a self-hosted, open-source feature-flag platform with built-in experimentation, multi-language SDKs, and an optional managed cloud.
Privacy-first open-source analytics for mobile and desktop apps
Aptabase is an open-source analytics platform for mobile, desktop, and web apps that replaces Firebase or Google Analytics with fully anonymous event tracking.
Fast, modern, secure VPN tunnel
WireGuard is an open-source VPN tunnel that connects peers into private networks with a small auditable codebase, modern Noise-based cryptography, and in-kernel speed.
Self-hosted file sync and sharing with a fast, lightweight sync engine
Seafile is a self-hosted file sync and share platform where synced libraries, desktop and mobile clients, and Community or Professional editions keep files under operator control.