Reverse Dictionary - Describe a concept and get back a list of words
NWEA Assessments - NWEA Assessments creates a personalized assessment experience by adapting to each student's learning level.
Silicon Valley Dictionary - Urban dictionary meets Silicon Valley
ALEKS - ALEKS is a web-based artificially intelligent assessment and learning system that uses adaptive questioning to accurately determine exactly student knows.
Meaning Monkey - Find the definition and meaning of anything.
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!