CubeTwister is a Scripts software developed by Werner Randelshofer. After our trial and test, the software is proved to be official, secure and free. Here is the official description for CubeTwister:

BS Editor: CubeTwister is a companion to the Rubik's Cube. It is suited for beginners, cube lovers, speed-cubers and mathematicians.

You can use it as a tool to solve your scrambled cube, to document your collection of cubes, to describe your solution algorithms, and to analyse the permutations of cube parts.