iOS: Remembering random tidbits of information like a new phone number or a quote is tough for a lot of us. Eidetic is an app that makes remembering a little easier by repeatedly sending notifications at specific intervals.
All you need to do is pick something simple you want to remember, and then Eidetic will remind you to test yourself on that data. You can use Eidetic to drill just about any piece of information you want into your head, but it's most helpful for short bits of info that you need to remember quickly.
Eidetic is free to check out for one fact, but you'll need to upgrade to the Pro version for $1.99 if you want to test yourself on more things.