Anki - https://github.com/dae/anki https://github.com/dae/anki It's obviously not as full featured as Rosetta Stone, nor does it come with courses, nor does it

Anki - https://github.com/dae/anki https://github.com/dae/anki It's obviously not as full featured as Rosetta Stone, nor does it come with courses, nor does it use voice recognition - but it does rely on basically the same research into memory and I've had a lot more success using Anki than Rosetta Stone.