I left my Ti-85 behind a long time ago and have been using Maple on my linux boxes for years. If you're in the market for a CAS, it has roughly 1500 more functions than Mathematica http://www.mapleprimes.com/questions/134579-Total-Number-Of-Functions-In-Maple#comment134588 and a perpetual student license is a lot less cash than Mma, plus it can be easily integrated into Matlab using the Maple toolbox for Matlab.
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I left my Ti-85 behind a long time ago and have been using Maple on my linux boxes for years. If you're in the market for a CAS, it has roughly 1500 more functions than Mathematica http://www.mapleprimes.com/questions/134579-Total-Number-Of-Functions-In-Maple#comment134588 and a perpetual student license is a lot less cash than Mma, plus it can be easily integrated into Matlab using the Maple toolbox for Matlab.