Megasis  
   Freeware emulator for Windows.
   http://www.geocities.co.jp/Playtown-Spade/3163/

Virtual Genesis  
   Freeware emulator for DOS.
   http://ourworld.compuserve.com/homepages/JASONMEEHAN/VGEN.HTM

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

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

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

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

Xega  
   Freeware emulator for Windows. Supports 32X and Sega CD.
   http://xega.emucamp.com/

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

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

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

DGen  
   Open source emulator port for MacOS.
   http://www.bannister.org/software/dgen.htm

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

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

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

AGES  
   A freeware emulator for Windows. Supports 32X and Sega CD.
   http://emulazione.multiplayer.it/ages/

Sega Roms  
   Small ROM site with reviews. [English/Turkish]
   http://smdgames.20m.com/

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

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

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