Best CAS for Android! Started using this after Octave port became nagware. It takes a while to get used to but is breeze once you get to know the commands and syntax. The manual is very helpful and have quite a few examples for almost all the commands. Since the outputs are rendered using MathJax  you can export the output to LaTeX. This makes it great companion for compiling TeX documents on the go. Kudos to the developer for bringing Maxima to Android and keeping the spirit of open source! Much appreciated.
March 25 2016