Free stuff for teachers
We recently launched the world's largest practice test and assessment site! In total, we have over 35,000 professionally written problems and thousands of distinct practice tests across 120 subjects.
Each question is tagged down to the core academic concept being tested: http://www.varsitytutors.com/practice-tests
The platform also includes free web-based classroom assessment software: http://www.varsitytutors.com/classroom-assessment