SVGSlice is a simple tool which generates chopped up images from Inkscape SVG drawings. To figure out where to cut, SVGSlice can use Inkscape's built in guides (for simpler, grid-like cuts), or it can use a specially named "slices" layer that contains rectangles that mark areas to slice. Demo files showing both approaches are included.
Tiled is a general purpose tile map editor. It's built to be easy to use, yet it is capable of catering to a host of varying game engines, whether your game is an RPG, platformer, or Breakout clone. Tiled supports plugins to read and write map formats other than its own map format.
TOIlet is a tool that renders ASCII and ANSI art text, just like FIGlet but with many enhancements. It has support for Unicode glyphs and ANSI colours within fonts and ANSI colour input. It can also apply filters on the output (rotate, colourise, etc.) and can produce output in various formats, including ANSI, HTML, and SVG.