The CoCo wiki project was started on October 29, 2004. --OS-9 Al

From CoCopedia

M.E.S.S Multiple Emulator System is a very versatile emulator based on the MAME Arcade Emulator and as the name implies it emulates multiple vintage console and computer systems including the CoCo.

Unlike VCC which only emulates a CoCo 3 MESS basically can emulate just about all past CoCo incarnations.