You could have downloaded TI-Nspire CAS Student Software 5.4 for Mac from our application library for free. The program lies within Education Tools, more precisely Teaching Tools. This Mac application was originally designed by Randall Brown.
From the developer:
This program satisfies math and science curriculum needs from middle school through college. It lets you symbolically solve equations, factor and expand variable expressions, complete the square, find anti-derivatives, compute limits, find exact solutions in irrational form and more.
You may want to check out more software for Mac, such as NFB.ca Film Viewer, Driving Instructor Software for MAC or Lawn Care Software for MAC, which might be related to TI-Nspire CAS Student Software.
Calculators
Teaching Tools