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Pre-Grade Your Paper: Free Online Grammar Checker, Proofreader, and More "PaperRater.com is a free resource, developed and maintained by linguistics professionals and graduate students. PaperRater.com is used by schools and universities in over 46 countries to help students improve their writing. PaperRater.com combines the power of natural language processing (NLP), artificial intelligence (AI), machine learning, information retrieval (IR), computational linguistics, data mining, and advanced pattern matching (APM). We offer the most powerful writing tool available on the internet today."

which bills itself as a "free online grammar checker, proofreader, and more." It really is free, though on their "pricing" tab, they reserve the right to start a premium service at some point in the future. I haven't actually used it, but would be curious what folks on this list who try it think of its features.

Early Childhood math site - great explanations and practice sets.