AJAX Spell Checker Like Gmail: GoogieSpell
GoogieSpell is Gmail-like spell checker that you can use in your applications.
It is AJAX based, supports over 27 languages and well-documented.
This AJAX spell checker simply sends a query to Google’s spell checking address: "https://www.google.com/tbproxy/spell?lang=" and displays the results and recommendations according to the result of this data.
GoogieSpell is well tested to work in all major browsers.