quizlet.com and purposegames.com are two great ones.
On quizelt, you can make your own sets with a term and a definition/date/person/etc. and study them using several different tools which use the information you have put in.
purposegames is a little more versatile you can make games using pictures, multiple choice, shapes, matching, and it has a lot of neat features too! chek it out! you can even follow other people and the games they have made.
If you decide to use purposegames, I'm Okie2015 and if we're mutual followers I can message you and help you if you need it!