DSx86 is a PC/DOS emulator for Nintendo DS written by Patrick Aalto. It's purpose is to allow you to run old DOS games on your Nintendo DS game console. Some of the older games run quite good and bring back memories. Read more about DSx86 v0.31 (Beta) (DOS emu for NDS)
Woopsi is a Nintendo DS GUI library for rapidly creating user interfaces for homebrew software. Modelled after the AmigaOS windowing system. Read more about Woopsi v1.2 (NDS misc)