Announcing symia 0.1
Most of free software related to symbolic calculus is focused on providing a human interface, with emphasis on expression simplification and exhaustive algorithms and formulas.
Very few can be used as a libraray, with a clear and documented API. Even less use C++, and none is licensed as LGPL
Symia (short for "symbolia") fills this gap. It was developed for industrial needs, and is released by Sylphide Consulting in the hope it could be useful to others.
Examples of what can be done is provided on the web page