Math-o-mir Software (free):

Math-o-mir official version, English: v2.0

Math-o-mir official version, German: v2.0

Math-o-mir latest beta, English: v2.1 beta2

Math-o-mir literature (free):

Math-o-mir Users Manual, English: v2.0

Math-o-mir Brief Guide, English: v2.0

Math-o-mir Keyboard Tutorial, English: v2.0

The source code (free):

The source code is available on GitHub.