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.
iSpring QuizMaker - iSpring Quiz Maker is easy-to-use quiz software. Create interactive quizzes and surveys in HTML5 & Flash and embed them in a website or publish for any LMS!
LimeSurvey - LimeSurvey: the Online-Umfrage Tool - Open-Source Suryeys
Disamina - Online assessment software and LMS
Quizlet - Quizlet allows you to review and create flashcards for a variety of subjects, such as math and reading.
FlexiQuiz - FlexiQuiz is a powerful online test generator that enables you to create engaging online quizzes, tests, or exams in minutes. Choose from 100's of features to create a customized quiz that meets your objectives for business, education, or fun.