ALEKS - ALEKS is a web-based artificially intelligent assessment and learning system that uses adaptive questioning to accurately determine exactly student knows.
Star Chart - Stellarium is a planetarium software that shows exactly what you see when you look up at the stars. It's easy to use, and free. Read more about Star Chart.
ExamView Assessment Suite - ExamView lets you can create assignments, launch classroom assessment questions and collect real-time responses to evaluate student performance.
Celestia - Real-time 3D visualization of space
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!
Stellarium - Stellarium is a free open source planetarium for your computer.