Critical Mass Modula-3
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Critical Mass Modula-3 is an implementation of Modula-3.
Other implementations of Modula-3.
Critical Mass Modula-3 is an example of a compiler. You may find the programming tasks that have been solved using it here.
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.