I built this typing mastery application yesterday. It took just few hours.I wanted to have features that I wanted to use for improving the typing speed. It is usually the combinations of the best features that I like from various paid and free touch type tutoring applications.Right now the Linux binaries work well. For Windows you need to allow the binary to run. And Mac the binaries wont run at all untill I sign them ( I still don t have developer account).Have fun. Let me know your feedback.