xTang 

xTang is a fully windows explorer integrated mail program with html-mail support, spam protection, spell checking in 20 languages and easy to use message rules. Includes routines for converting from your old mail program to xTang.
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Spellaroo! Spell Check for Install Messaging 

Finally a Spell Checking program for your Instant Messenger programs. Educators have stated that one of the most important ways people judge our intelligence and business acumen is how we speak and spell.
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MR/2 ICE Email and Newsreader Client 

A full featured multithreaded email and newsreader client for Windows. Easy-to-use notebook style used to organize folders and newsgroups. Loaded with features including spell checking and even a thesaurus (sorry, English only).
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Aspose.Spell 

Aspose.Spell multilingual spell checking component that can enable you to check spelling in more than 20 languages, including Afrikaans(ZA), Catalan(ES), Spanish(ES) and Swedish(SE) etc.The last version Made Spell and other classes serializable.
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Top Secret Crypto Gold 

Top Secret Crypto Gold includes Top Secret Chat and Top Secret Journal, along with file and e-mail encryption. Includes spell checking for e-mail, journal, and chatting. Free for personal private use. Commercial use requires an inexpensive license.
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Total Validator Tool 

Performs four important validations on your web pages: True (X)HTML validation against published DTDs; accessibility validation against the W3C and US Section 508 guidelines; spell checking against one of five languages; and checking for broken links
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