I know of two very early stage systems in ruby: https://github.com/jdleesmiller/rucas https://github.com/jdleesmiller/rucas (which I wrote) and http://brainopia

I know of two very early stage systems in ruby: https://github.com/jdleesmiller/rucas https://github.com/jdleesmiller/rucas (which I wrote) and http://brainopia.github.com/symbolic/ http://brainopia.github.com/symbolic/ I don't think either is really very useful at this stage (certainly mine isn't), but ruby does provide some very nice metaprogramming support for encoding and manipulating symbolic expressions.