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I'll answer!

Check out Anki and Memrise. They, in my opinion, are the best SRS alternatives out there.

What's your opinion on Mnemosyne?

I once wrote https://github.com/darius/spaced-out which is certainly not serious competition, but came from a similar idea: build the deck from the most common words in the language (automated using an aligned parallel corpus), and replace the Anki interface because I didn't like it.

It's probably a better starting-point than starting from scratch, I'll say that for it. (I wasn't interested enough in language-learning to take it further.)

Give SuperMemo a try, it's a Polish company.

http://www.supermemo.net/