Do you know a free or open source website spell-checker?

We are looking for a free to use website software for spell checking our sites before they go to production. A basic search online took me to these pages: Net MECHANIC Text Trust Orango

I did the trial in NetMechanic and I got a bogus email with no result and encouraging me to buy their paid subscription. Any suggestions are appreciated.

From stackoverflow

• NetSpell SpellChecker. It's Free and Open-Source.

  Edit: It's not for Java, but it is for .NET; and I don't think it'd be too difficult to port it over to Java.

• A project I work on is about to implement Jazzy as a spell-checker. It's free, open-source (LGPL) and the dictionaries are simple text files and easy to add your own words too.

  Edit to add:
  We're spell-checking HTML with it too, and I think it does this "out-of-the-box".

  banjollity : Related question here: http://stackoverflow.com/questions/559510/looking-for-java-spell-checker-library