You want to do more with your Mindstrom: Use all the sensors you already have in your devices: gyroscope (in smartphone or tablet), mouse or touch screen, webcam as if they were standard EV3 sensors ! With Gnikrap you can use the Lego sensors and motors and the XSensors (eXternal Sensors) in the same program with the same straightforward API.
The API available is fully documented with code snippet. There is also some more real samples that are commented.
As Gnikrap is open source, you can consult, modify and redistribute the software.