Creature

Creature 2D Skeletal and Mesh Animation Tool.
GeeXLab

GeeXLab – cross-platform tool for game development, 3D programming, creative coding and prototyping.
Amulet

Amulet is a free Lua-based audio/visual toolkit suitable for small games and experimentation.
Gamesalad

GameSalad is a game development platform for iOS, Android and HTML5.
Orx

Orx – a portable open source game engine.
Corona SDK

Cross-platform mobile app development.
GameSparks

GameSparks is a Backend-as-a-Service solution provider to mobile game developers to help them…
LibGDX

Libgdx is a Java game development framework that provides a unified API that works across all…
RenPy

Ren’Py is a free and cross-platform visual novel engine that helps you use words, pictures, and…
Platinum Arts Sandbox

Platinum Arts Sandbox Free 3D Game Maker is an open source free game maker, free RPG Maker, free…