tinySpell - A spell-checker for Windows. Checks text in clipboard and/or on the fly in any Windows program. Small and easy to use. Resides in the taskbar notification area. Free download.
Druide Antidote - Que vous rédigiez une lettre ou un courriel, cliquez sur un bouton et voyez s’ouvrir un des ouvrages de référence parmi les plus riches et les plus utiles jamais produits.
ispell - Ispell is a program that helps you to correct spelling and typographical errors in a file.
Grammarly - Clear, effective, mistake-free writing everywhere you type.
LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.
Enchant - The easiest way to scale personalized customer support