Stellarium - Stellarium is a free open source planetarium for your computer.

ALEKS - ALEKS is a web-based artificially intelligent assessment and learning system that uses adaptive questioning to accurately determine exactly student knows.

Space Engine - Space Engine is a realistic virtual Universe you can explore on your computer.

ExamView Assessment Suite - ExamView lets you can create assignments, launch classroom assessment questions and collect real-time responses to evaluate student performance.

Hacker News Search - a faster hnsearch

Canvas by Instructure - The Canvas LMS is the world's fastest growing learning management system. Check out favorite features and schedule a live demo!