Simply Learn Languages - A phrasebook of 50+ languages for traveling (with audio)

Anki - Anki is a program which makes remembering things easy. Because it's a lot more efficient than traditional study methods, you can either greatly decrease your time spent studying, or greatly increase the amount you learn.

Kommit - Flashcards / Spaced Repetition System with text-to-speech

Kanji Book - Learn Japanese online with kanji mnemonics. Study all of the jōyō kanji with the best spaced repetition system. It's easier and better than any flashcard app.

LearnObit - A tool for your learning, like Anki & Workflowy in one

Repetitions - Repetitions is a cross-platform spaced repetition system (SRS), an intelligent flashcard application that makes learning and memorization easy.