Texas Instruments has its TI-Nspire Computer Algebra System (CAS) for the iPod Touch in the iOS App Store for FREE (regularly $29.99) for a limited time.

Texas Instruments, the No. 1 recommended brand of graphing calculators in the U.S., has optimized its most powerful Computer Algebra System (CAS) math engine for an all-in-one iPad app that makes teaching and learning math more engaging, meaningful and … fun!