GradeProof - Proofreading with Artificial Intelligence
Grammarly - Clear, effective, mistake-free writing everywhere you type.
Grammatica - AI powered writing assistant
Grammarian PRO3 - Grammarian PRO3 is a feature-rich grammar checker that enables you to write better content without taking assistance from the English teacher.
Qordoba - Manage text like code
GrammarChecker.net - Grammar Checker is an online spell check tool. It effectively works on English sentence correction, Punctuation mistakes of 28 other different languages.