littleb
Little b is a language to build mathematical models of complex systems.

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Getting source trough cvs:

cvs -d:pserver:anonymous@littleb.cvs.sourceforge.net:/cvsroot/littleb login
cvs -z3 -d:pserver:anonymous@littleb.cvs.sourceforge.net:/cvsroot/littleb co -P b1

Little b is released under the MIT license.