SuperMemo

SuperMemo itself is free, but components making it usable are non-free.
From website: Additional features multiple user management; with only one installation many users can learn from the courses, without the need to copy them, simultaneous learning from many courses, without the need to switch between them manually, selection of the material, including and excluding it from repetitions, a built-in keyboard with diacritics of a given language, a concise dictionary including the course vocabulary, a schedule of the repetitions planned for a given month, automatic online update of the application and course material, a built-in speech analyser, which allows you to test and correct your pronunciation on your own.

Application Details:

Version:	UX
License:	Free to use
URL:	http://supermemo.com
Votes:	3
Latest Rating:	Silver
Latest Wine Version Tested:	1.4.1

Maintainers: About Maintainership