euler math toolbox
Free (Open Source)   

This program is powerful mathematics program but it is easy to handle

prgrns

Prgrns

 2.0
Free   

Calculations with arithmetic and geometric progressions, commercial interest and annuities

freemat

FreeMat

 4.0
Free (Open Source)   

FreeMat is a free environment for making quickly process of prototypes and data

mathomatic

Mathomatic

 16.0.5
Free (Open Source)   

This is a symbolic calculate program for making complex operations