LanguageTool is described as «Free proofreading tool for LibreOffice, Apache OpenOffice, Microsoft Word, Ulysses, » and is a very popular Grammar Checker in the web browsers category. There are more than 25 alternatives to LanguageTool for a variety of platforms, including Online / Web-based, Windows, Mac, Google Chrome and Linux. The best alternative is Grammarly, which is free. Other great apps like LanguageTool are Grammalecte, ProWritingAid, Slick Write and Druide Antidote.LanguageTool alternatives are mainly Grammar Checkers but may also be Plagiarism Checkers or Text Editors. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of LanguageTool.
