Classic 2D side-scrolling platformer game
Command & Conquer: Remastered Collection
Flexible level editor
Free game engine for development of desktop, mobile, and web games
Eureka is a DOOM map editor
Cocos simplifies game creation and distribution with Cocos Creator
Cross-platform 2D and 3D game engine with modular architecture
A 2D multiplayer space shooter game
Pixel-art map visualizer for Minecraft
A 2D scrolling platform shooter, inspired by Duke Nukem 1
A free 3D game engine to create games and realtimes scenes for Windows
turn-based wargame/simulator
2D Game Engine
Open RealStrategyGameLibrary (Engine)
2D Game Engine with Lua Scripting made on top of SFML
A 2D game engine and level editor
KBall, game of skill and reflexes, non violent, suitable for all age
2D ARPG Engine
Battlefleet - Naval warfare at the turn of the century: 1895 - 1905
Grepolis utility