ALEKS - ALEKS is a web-based artificially intelligent assessment and learning system that uses adaptive questioning to accurately determine exactly student knows.
LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.
ExamView Assessment Suite - ExamView lets you can create assignments, launch classroom assessment questions and collect real-time responses to evaluate student performance.
Grammarly - Clear, effective, mistake-free writing everywhere you type.
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!
Gramlee.com - Online grammar check, proofreading and copy editing services.