plagiarism checker

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

A spell checker designed for use with on-line communications programs.

Mail Checker - Your mail box watch dog.

Freeware Spell Checker for windows clipboard!

The SEO Rank Checker is a nice little search engine.

Aella Email Address Checker is designed to check long lists of email addresses

Website uptime checker tool evaluate realtime performance status of your website

Free english spell checker for windows installs in seconds

Filler Item checker - finds filler items on amazon to qualify for free shipping

Rank Checker checks a website's rankings on google.com and google.co.uk.