aspose spell

A stand-alone multi-lingual spell checker for any Windows application.

MSDN article "Creating a Custom Spell-Checker with Word 2003 and Visual Basic

Freeware Spell Checker for windows clipboard!

Free english spell checker for windows installs in seconds

Free spell checker for Internet Explorer installs in seconds

Clipboard capture tool with history, favorites, spelling, formatting, and more.

Generates freshly created designs that look like a spirograph gone wild!

A powerful and handy toolbar for IE with form filler and spell checker

Put a spell on your computer screen with the new babbling screensaver!

Speller is designed for Delphi: Add spell check capability to any application.