Open Web Games, GameOn and Construct 2


(edit: Construct 2 is going Closed Source, I'll either edit out this part or keep it for reference, but don't get your hopes up when reading this)

Scirra Construct is one of the few FOSS competitors to the proprietary GameMaker 2D game development suite (Gluon, Enigma and Game-Editor being the others). Unfortunately, the system has been limited to Windows since its inception due to relying on DirectX fiddlies, however, that has all changed...

Popular

RubyWeekend, but also PyDay

Open Source Game Engines

Anticube 2 - a game within a game