Cross-platform, graphics API agnostic, "Bring Your Own Engine/Framework" style rendering library.

FreeRDP is a free remote desktop protocol library and clients

Simple Directmedia Layer

🐍🎮 pygame (the library) is a Free and Open Source python programming language library for making multimedia applications like games built on top of the excellent SDL library. C, Python, Native, OpenGL.

Lightweight and modular C++11 graphics middleware for games and data visualization

Improved version of the X-Ray Engine, the game engine used in the world-famous S.T.A.L.K.E.R. game series by GSC Game World. Join OpenXRay! ;)

SuperTux source code

🌳🏡🏢🌲 A city building simulation game

Chocolate Doom is a Doom source port that is minimalist and historically accurate.

Open-source clone of the original X-Com 👽

An infinite-canvas paint program

A Beautiful Gemini Client

GUIslice drag & drop embedded GUI in C for touchscreen TFT on Arduino, Raspberry Pi, ARM, ESP8266 / ESP32 / M5stack using Adafruit-GFX / TFT_eSPI / UTFT / SDL

A free and open-source Touhou Project fangame

Zep - An embeddable editor, with optional support for using vim keystrokes.

🐍🎮 pygame - Community Edition is a FOSS Python library for multimedia applications (like games). Built on top of the excellent SDL library.

DevSkim is a set of IDE plugins, language analyzers, and rules that provide security "linting" capabilities.

Opensource crossplatform Fallout 2™ game engine writen in C++ and SDL.

GraphQL Engine built with Python 3.6+ / asyncio

Shockolate - A minimalist and cross platform System Shock source port.