ExactWord 

ExactWord (formerly YTSEditor) is a word processor editor with Rich Text/Plain Text editing, Spell Check, ActiveSpell, Thesaurus, Dictionary, Paragraph Options, Format Styles. Dictionary Update Wizard automates adding more spelling dictionaries.
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As-U-Type 

On the fly spell check and speed typing software that checks and automatically corrects spelling as you type, automates difficult and repetitive typing tasks, supports multiple clipboards and all other solutions to give you accurate and fast typing
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SpellExpress(tm) -- Instant Spell-Check, Thesaurus & Dictionary 

SpellExpress provides instant access to a spell-check and thesaurus directly from your desktop. With SpellExpress you can spell-check a word or phrase and find meanings, synonyms, and antonyms from any application.
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GlobalSpellChecker 

GlobalSpellChecker is a tool for checking spelling or meaning of words from any application using Microsoft Word. It displays the meaning or spelling suggestion in a non-disturbing way so that you do not have to shift from the application.
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As-U-Type Speller 

An OS-level real-time spell check software that checks and automatically corrects typographical and spelling errors for everything you type in all Windows programs. It learns your mistakes, adapts to your typing habit and becomes smarter with use.
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