Mnemosyne – Free and open-source accelerated learning & memory software

Mnemosyne is a free, open-source and spaced-repetition (an evidence-based learning technique) flashcard program for Windows, Mac, Linux and mobile platforms, developed by Peter Bienstman from Belgium in 2003, written in Python. It can help you learn as efficiently as possible, i.e.: optimizes your learning process. Besides, it's also a research project into the nature of long-term memory.