Spelling & Grammar Checkers

These sites offer free English grammar and spelling checkers.  Support may or not be available.
Spellchecker.net — This online service checks spelling, grammar, and also offers a thesaurus.  Just enter your text into the box and hit “submit.” A paid version is also available.
AbiWord — This is a free word-processing program that is compatible with other popular word-processors.
Language Tool — An open-source tool that checks grammar in several languages (does not check spelling, however). There is a stand-alone version and also one that integrates into OpenOffice.org.

ProofReadBot — Free online grammar checker.