PicoDrive
- Open source emulator for RISC OS. Originally developed for mobile devices such as PDAs and mobile phones.
- http://picodrive.acornarcade.com/

Genital
- A freeware emulator for DOS.
- http://www.trzy.org/

Xega
- Freeware emulator for Windows. Supports 32X and Sega CD.
- http://www.eidolons-inn.net/tiki-index.php?page=Triton

Genesis Plus
- An open source emulator for DOS, MacOS, and Windows by Charles MacDonald and Richard Bannister.
- http://cgfm2.emuviews.com/genplus.php

DCGen
- A Dreamcast port of Generator.
- http://sourceforge.net/projects/dcgen/

PGEN
- An open source emulator for PlayStation2 based on Generator.
- http://pgen.gamebase.ca/

retroDrive
- Freeware emulator for Windows. Supports 32X. Previously known as Gensx and Vegas.
- http://www.tmeekins.com/retrodrive.htm

FreeRoms: Genesis
- Alphabetic sorted ROM list with rating system. (607+ ROMs)
- http://www.freeroms.com/genesis.htm

Blades Of Vengeance
- Some ROM Images.
- http://accumulator.webz.cz/download.htm

Gametown
- Offers a few ROMs.
- http://www.familydomain.com/gametown/sega.html

Genecyst
- Freeware emulator for DOS.
- http://bloodlust.zophar.net/gen/genecyst.html

Gens
- An open source emulator for BeOS, Linux, and Windows. Multilanguage and Sega CD support.
- http://gens.consolemul.com/

Generator
- Open source emulator for AmigaOS, DOS, Linux, MacOS and Win32.
- http://www.squish.net/generator/

DGen/SDL
- Open source emulator port to Unix/SDL.
- http://www.pknet.com/~joe/dgen-sdl.html

Consoles - Megadrive
- A table of the latest emulators and their ratings.
- http://www.emulatronia.com/consolas/md.htm