Critical Mass Modula-3 is an open source implementation of Modula-3 originally created by Critical Mass.

CM3 is the 'main' Modula-3 implementation currently.

There is very little C code in the implementation, even in the runtime.

Recently (About the middle of 2009) CM3 has seen a surge in development, and a stable release is planned. Version 5.8 RC3 is available, with a stable release in the next few months.

  • [http://modula3.elegosoft.com/cm3/ Critical Mass Modula-3]