The Virtual ColecoVision Homepage
Freeware emulator for Win32 and the Java Virtual Machine. Sources for the Java version are available.

ColEm
Open source emulator for Unix/X by Marat Fayzullin.

ColEm for OS/2
ColEm port for OS/2.

ColemPSX and ColemPS2
ColEm port for PlayStation and PlayStation2.

Mugrat
An emulator for MacOS X by Richard Bannister.