SSuite Spell Checker - SSuite Office's free spell checker provides you with a handy means of checking the spelling in order to make sure your words are correctly typed or written.
DSpellCheck - Yet Another Notepad++ Spell-checking Plug-In
Ginger - Powerful and effortless desktop & mobile solutions for improving your writing and productivity. Ginger Software is your personalized editor - everywhere you go.
tinySpell - A spell-checker for Windows. Checks text in clipboard and/or on the fly in any Windows program. Small and easy to use. Resides in the taskbar notification area. Free download.
Clipboard Help+Spell - Clipboard Help+Spell is a text-based clipboard utility with the following features:
Asutype - Automatic on-the-fly spell checking.