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KlayGE is an open source, cross-platform game engine with plugin-based architecture. It provides a framework to make game development, testing, porting as simple as possible.
Download: http://sourceforge.net
Website: http://sourceforge.net/
MonoGame is an Open Source implementation of the Microsoft XNA 4 Framework. Our goal is to allow XNA developers on Xbox 360, Windows & Windows Phone to port their games to the iOS, Android, Mac OS X, Linux and Windows 8 Metro. PlayStation Mobile development is currently in progress.
Website & download: http://monogame.codeplex.com
DeleD is a 3D modeler and level-editor combined into one. It focuses at game development and is specifically designed to create static objects/worlds.
Download : http://sourceforge.net
Website: http://www.delgine.com
Php Stategy Game Engine (phpSGE) is an open tool for creating a php strategy browsergame that you can customize.
PHPsge is very easy to use and it has a simple administration panel (for editing the game), and auto istaller.You can easy canghe the style of your game changing the css (that you can customise or dowload). You can browse the various version here: Features If you want a detalied list see the RoadMap
Download: http://sourceforge.net
Website: http://sourceforge.net/apps/mediawiki/phpstrategygame/
Microsoft XNA Game Studio 4.0 makes it easier than ever to create great video games for Windows-based PCs, Xbox 360 consoles, and Windows Phone
Website & download: http://www.microsoft.com