A Free Online and Offline Grammar, Spell Checker Language Tool
Lot of free grammar checker available on the internet but this LanguageTool has multi options, works online and also available in the form of application for your desktop. IT is one a very popular open-source proofreading, grammar & spell check software. Using this English grammar checking tool you can improve your writing skills considerably which ultimately lead to greater confidence in your writing abilities.
Language Tool provides a good extension for OpenOffice and LibeOffice. Stand-alone for your Desktop and also browse extension for Firefox. Language Tool is now supported multi languages like Asturian, Belarusian, Breton, Catalan, Chinese, Danish, Dutch, English, Esperanto, French, Galician, German, Greek, Icelandic, Italian, Japanese, Khmer, Lithuanian, Malayalam, Polish, Portuguese, Romanian, Russian, Slovak, Slovenian, Spanish, Swedish, Tagalog, Ukrainian etc.
Download LanguageTool software for Windows from below link and remember must install the Java Runtime application on your PC: www.languagetool.org