ClassicGaming.com
classicgaming.com
Large collection of ROM Images, and emulators for classic systems.
The Dump
classicgaming.com
Rated, working ROMs for Neo Geo, Genesis and TurboGrafx-16.
Demo Roms
emucamp.com
A nice collection of Technical Demos (some with source code) for various systems. Sadly not anymore updated.
Dave's Emu
davesemu.com
Public Domain ROM Images for some systems.
buttonBASH!
buttonbash.com
Public domain ROM Images for various systems. Also features a forum and some tools and documents.
PDRoms
pdroms.de
ROM Images of console and arcade software released to the public domain.
RomCenter Home Page
romcenter.com
Managing tool for various systems with built-in zip function.
ENES
enes.emunova.net
An european dump group whose goal is to save, numerize and immortalize NES games currently out of sight, which are called undumped games.