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Public domain ROM Images for various systems. Also features a forum and some tools and documents.
ClassicGaming.com
Large collection of ROM Images, and emulators for classic systems.
Dave's Emu
Public Domain ROM Images for some systems.
Demo Roms
A nice collection of Technical Demos (some with source code) for various systems. Sadly not anymore updated.
RomCenter Home Page
Managing tool for various systems with built-in zip function.
The Dump
Rated, working ROMs for Neo Geo, Genesis and TurboGrafx-16.