Maxima - Maxima is a fairly complete computer algebra system written in Lisp with an emphasis on symbolic computation.
Payable - Easily manage and pay your contractors
SMath Studio - Tiny, powerful, free mathematical program with WYSIWYG editor and complete units of measurements support.
ContractorPlus - Everything home service contractors need in one app.
GeoGebra - GeoGebra is free and multi-platform dynamic mathematics software for learning and teaching.
Bold - Ultra-fast anonymous publishing platform.