Cross-Platform C++ 2D/3D game engine
Open QR Code is an open-source, cross-platform app
Real-time physically based rendering engine for Android, iOS, and more
Java/JavaFX/Kotlin Game Library (Engine)
A pure Go game engine
Naev is a 2d action/rpg space game, action, rpg and simulation
An easy to use 2D HTML5 game engine written in TypeScript
GemRB is a portable open-source implementation of the Infinity Engine
Orx: Portable Game Engine
Action RPG that's easy to mod
Delphi : VRCalc++ OOSL & + (Paged List, TextEditor, VRAstroVision ...)
Delphi Java - VRCalc++ OOSL (Script) and + (Binary Exec Distro)
General Purpose Engine for Graphic Adventures.
A free 3d game for PC that does not limit the player. Fight,Build,Gain
functions for 2D/3D graphics + realistic driving simulation
Vivid3D is an open-source 3D engine with powerful 2D UI.
Heros of Jin Yong 3D Remastered
2D Game Engine
Vivid is a modern C++ 3D engine using OpenGL4+
Modern 3D engine and IDE written using C# and C++.