Hi, I'm Scinart, and today I'll recommand a great software for keystroke visualization, Carnac.

you can get it from https://github.com/Code52/carnac

Carnac is a keyboard logging and presentation utility for presentations, screencasts, and to help you become a better keyboard user.

Carnac is a free and open source software under Microsoft Public License (MS-PL), which means you are definitely free to modify, distribute and sell derivative works.