Photon
A graphing calculator that's both powerful and easy to use.
...In addition to regular graphing, Photon can plot integrals, first and second derivatives, tracing, animation, matrix math, and degree / radian mode. Photon can find roots, minimums and maximums, points of inflection, and it can fit several types of best fit lines and curves to data sets. Log and semi-log graphing are also available.
Photon can save data to several file types, including images such as .jpg and .png. Display options are also available, including a dark / light theme for optimal visibility from a projector.
Photon's primary goal is to be easy to use while retaining a feature-rich design. ...