This is my third Ludum Dare. Here is my toolbox:

Language: JavaScript/HTML5
Framework: Jaws
Base code: https://github.com/meszka/ld29/tree/base-code (includes a simple Tiled map reader for Jaws and other small utility functions)
Editor: Vim
Graphics: Aseprite, Gimp
Sound: Bfxr, possibly Sunvox
Other tools: possibly Tiled for editing maps