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...The mailing list has been moved over to https://groups.google.com/forum/#!forum/yacas . The downloads section at sourceforge will be kept up to date for the foreseable future.
Yacas is an easy to use, general purpose computer algebra system. It uses its own programming language designed for symbolic as well as arbitrary-precision numerical computations. The system comes with a library of scripts and extensive documentation.
Yagy (http://sourceforge.net/p/yagy) provides full yacas experience wrapped in a simple and intuitive graphical interface.
The Simply Magical Programming Language, or SMIPL, gives everyone the chance to create their own programs without difficulties. Created to be as easy as english to understand, and let's you experience the power of a computer by writing to it.