A free app for Android, by Paul Falstad.

Menta is a mind-bending, spell-casting, brain-teasing, and mind-reading application. Its goal is to read your mind.

How does it work?

Menta takes your input, runs it through a complicated algorithm, and then displays the results. It’s accuracy is unmatched, and it can even predict your future thoughts. It can also predict words you haven’t even typed.

What are the results?

Your results are the most important part of the application. It will display different words depending on the way you’re thinking. Some words will be easy to find and predict, while others are hidden and can be very difficult to find.