You can make it - Open Source MMORPG Platform
Fast and lightweight JavaScript game engine built on WebGL and glTF
utility collection for 2D game development in Java; sound-player
Game engine supporting many 3D/2D formats and graphic effects
lua dev plugin for unreal engine 4 or 5
Arianne is an engine to develop multiplayer online games like Stendhal
High-efficiency minimalist C++ wrapper for OpenGL 4.3
Vivid3D is an open-source 3D engine with powerful 2D UI.
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
Cinema Enters Game Console
Modern 3D engine and IDE written using C# and C++.
Example code for creating a 2D platform game in Java.
X3D Prototypes for the SMUOS Component
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
Generate ready-to-use disc images for your Sega Dreamcast system!
IRB is a game creation toolkit
2D ARPG Engine
Perl bindings to the Modern OpenGL API
A starter development kit that let you develop FF6-like games on PC.
2D game engine for traditional platform games