- LÖVE: http://love2d.org (Lua)

- Polycode: http://polycode.org (Lua / C++)

- SpriteKit (Obj-C / Swift)

(almost engines)

- Cinder: http://libcinder.org (C++)

- Processing: http://www.processing.org and http://www.processingjs.org (Java/JS)

- NodeBox: http://www.nodebox.net (Python)

- PyGame: http://pygame.org (Python)

I was recently starting to do a similar collection: https://github.com/albertz/Coding-Game-Intro

Although mine is more headed to become some game coding tutorials, probably C++ with SDL, Lua, or so. But that hasn't even started yet.

Which I find to be more streamlined and focused on game development.

Particle Designer - http://particledesigner.71squared.com/

Bitmap Font Generator - http://www.bmglyph.com/

There's a free trial download at www.betathegame.com