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Grammarly Editor is an automated proofreader that corrects contextual spelling mistakes, checks for more than 250 common grammar errors, enhances vocabulary usage, and suggests citations.

Free proofreading tool for LibreOffice, Apache OpenOffice, Mozilla Firefox and Google Chrome. Also available as a standalone application. Supports about 20 languages (on different levels) and allows customization.

Grammalecte is a French grammar checker.

Hunspell is the spell checker of LibreOffice, OpenOffice.org, Mozilla Firefox, Google Chrome, and it is also used by proprietary software packages, like Mac OS X and InDesign.

AnySpell adds spell checking capabilities to any application in Windows that uses edit boxes - in any language supported by OpenOffice dictionaries.It can also be used by developers as a library to add spell checking capabilities to their applications.

GNU Aspell, usually called just Aspell, is a free software spell checker designed to replace Ispell. It is the standard spell checker for the GNU software system. It also compiles for other Unix-like operating systems and Windows.

COL (Correcteur Orthographique de Latin) is a free tool providing assistance to check the spelling of a Latin text. Available for Microsoft Word, LibreOffice, OpenOffice.org and AbiWord, it includes a dictionary of about 400,000 Latin forms (classical and medieval Latin).

Spelling checker. Checks HTML, TeX/LaTeX, RTF, and ASCII (plain text). Hotkey spell checking in WordPad, Notepad, Email, browsers, etc.

cocoAspell is Mac OS X interface to Aspell – A more intelligent Ispell – that is being developed by Kevin Atkinson. Aspell is an Open Source spell checker designed to eventually replace Ispell. Its main feature is that it does a much better job of coming up with possible suggestions than Ispell does. In fact recent tests shows that it even does better than Microsoft Word 97's spell checker or just about any other spell checker I have seen. It also has support for checking (La)TeX and HTML files, and run time support for other non English languages. »

SpellCheckPlus is a grammar checker that finds common spelling errors and grammatical mistakes in English.

Ispell is a program that helps you to correct spelling and typographical errors in a file. When presented with a word that is not in the dictionary, ispell attempts to find near misses that might include the word you meant.

FreeSpell is a spell checker for any and all Windows applications. You can use it in Microsoft Outlook, Firefox, Visual C++, and even in Windows Explorer when renaming files. In fact, anything that supports the clipboard supports FreeSpell, and all it takes is a hotkey to invoke it. FreeSpell is based upon the Aspell engine, which means it offers the best spell checker around for people with weak spelling skills (as well for people who just need a quick proofread). FreeSpell comes with a large default dictionary and has custom dictionary support. »

MySpell is a simple spell checker that uses affix compression and is modelled after the spell checker ispell. MySpell was written to explore how affix compression can be implemented.