ColecoDS - An Emulator for the DS/DSi. Original port by Alekmaul. Phoenix-Edition by Wavemotion.
Nintellivision - an Intellivision Emulator for the Nintendo DS/DSi. High compatibility, custom overlay support, high score saving, tons of input mapping - all the quality of life improvements you need!
Atari 5200DS - Emulator for the DSi and above based on Alekmaul's work
XEGS-DS An Atari 8-bit Computer Emulator (specially targeted for the XEGS Gaming System but expanded to include virtually anything the Atari 8-bit computers can run)
Boot an nds file
Atari 7800 DS Emulator - updated from Alekmaul's original. Playability is more important to me than accuracy. It's no fun if the game won't run.
Atari 2600 emulator for DS (original code by AlekMaul). This is the PHOENIX EDITION which brings greater speed, compatibility and accuracy to the emulation on the DSi. New features such as instruction manuals and high score support included!
A Sega 8bit systems emulator for NDS
[Super] Gameboy [Color] emulator for the Nintendo DS
A GBA hypervisor for DS. (like nintendont for gc on wii)
SEGA Genesis/Mega Drive emulator for the Nintendo DS(i)
SNES emulator for DS
A Sega Genesis/MegaDrive emulator for the Nintendo DS
SnemulDS 0.6 [Revival]