I use Anki to keep my French and Japanese from deteriorating any further. Why those langauges? For Japanese, it's the usual answer: anime and manga. For French, I had to learn it in school and I just don't want to let it be forgotten.

A good number of the decks I use for language learning, I made for myself. Those that I've gotten from AnkiWeb were already gone, but here's some similar ones:

• French Sentences — a collection of French sentences, sorted from easiest (most simple) to hardest (most complex). This deck begins with very simple sentences, and slowly gets harder as you progress.

  I'm pretty sure this is an exact, if not a close copy of the one I got a while back.

• Dictionary of Japanese Grammar - DoJG — a deck made from the entries of “Dictionary of Japanese Grammar” (basic to advanced).

  My copy of this deck has undergone significant changes in card design (and function, like showing a random selection of the example sentences), but this one should be similar.

• Core 2k/6k Japanese Vocab — likely one of the copies of the various Core 2/6k Japanese Vocabulary decks that were recommended to me back when I started. The description I managed to find for my copy of the deck has this description:

  Using vocabulary and sentences derived from Smart.FM Core 2k and 6k and sorted by Cangy's program via 2001.Kanji.Odyssey kanji order. This detailed deck is designed so each new card contains the minimum amount of new kanji (and by proxy new words) creating an optimal i+1 learning environment.