For spaced repetition tools, besides Anki [2] there is also TinyCards [3].
Ultimately learning new things means building projects in them, but for rote memorization and when getting started spaced repetition is great. It works well because it is similar to how people learn naturally, the more you see something, the more you lock it into memory.
One of its authors also wrote a great essay about spaced repetition [2].
Anki is downloadable and TinyCards is web based and online. TinyCards has a community around it but Anki is probably more individual focused. Both are great tools and you will learn something everytime.
Another comparison highlights differences [1]
> They are both spaced repetition systems, but here are some key differences:
> - They have a different look and feel, so that is a subjective factor. Tinycards is more modern, while Anki is arguably starting to look dated.
> - Tinycards decks are limited to only 150 cards. This is a problem if you like big decks. Anki decks have no practical size limit.
> - Tinycards can connect directly to your Duolingo account and has shared decks (that the original owner still controls), but Anki has a lot of shared decks that instantly become "yours" (free to make changes) once you download them.
> - Anki has more overall functionality, so if you like to add pictures and audio, etc, then you have more control.
[1] https://languagelearning.stackexchange.com/questions/3309/ti...
Huge deal breaker for me. I have thousands of cards. If I study for any certification exam, I will have a minimum of a couple hundred cards.