Endless Sky is a sandbox-style space exploration game
FlightGear Flight Simulator: free open-source multiplatform flight sim
A free 3D game engine to create games and realtimes scenes for Windows
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Skyscrapersim Abandoned
Legandary Story of the Zarakite
A planetarium software that shows a 3D simulation of the night sky
A cross-platform interpreter for many point-and-click adventure games
A space race game in the style of A Dark Room
a sunsets openGL displays with moves and sound
Engine for games like's а Tyrian with random level generation.
Fight in the deep space against an alien invasion.
Mahasona engine is an open source game engine.
Minecraft clone written in C using modern OpenGL
Dodging shapes just got serious
Quickly access your vanilla Minecraft Launchers!
A MMORPG Engine, written in PhP and SQL
Make star maps for anywhere at anytime
Get those letters!
Scrolling + Skating + Spikes = Super Sky Skater
Minecraft Bukkit Pugin - Let It Rain