ZeroBrane Studio

ZeroBrane Studio is a slick IDE for Lua and Lua-based frameworks that supports syntax highlighting, code analyzer, remote console, full debugging, watches and stack view (Windows, Mac OSX, Linux).

Glyph Designer

Glyph Designer is a native OS X application that allows you to generate stunning bitmap fonts for use in your games. The fully visual user interface makes it easy to turn any TTF font into a high performance bitmap font with a unique look using effects such as inner and outer shadows, strokes and gradient fills. Once you have the look you want in the built in preview view, you can then export the font for use in Moai in a ready-to-use format.

Particle Designer

Particle Designer is a native OS X application that allows you to quickly create stunning particle effects for your games. The intuitive user interface gives you access to over 35 properties that control all aspects of how your particles render and animate. These properties can be changed in realtime and you can see the effects of your changes instantly in the preview area. This instantaneous feedback and built in drag-and-drop support for background images and textures saves hours of trial and error.

Texture Packer

TexturePacker creates sprite sheets and texture atlases for game development, css sprites for web design and optimizes images for mobile platforms.

Tiled

Tiled is a general purpose tile map editor. It's built to be easy to use, yet flexible enough to work with varying game engines, whether your game is an RPG, platformer or Breakout clone. Tiled is free software and written in C++, using the Qt application framework.