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PCFinder will scan an IP Address range that you input.

Port Magic is a port scan detector

Advanced Tool to Scan & Sweep Malicious Streams

Allow you to scan all your bookmarks and identify which ones are still valid.

Hazard Shield scan for and remove any malicious programs .

XSane is a graphical scanning frontend. It uses the SANE-library to talk to scan

Screen, Scan & Filter Stocks, covers worldwide, Technical Analysis, Candlest

Free virus, spyware, and adware scan for members of the Klingon empire.

ClamCour is a Courier filter that allow Clam Antivirus to scan incoming mails.

Scan2PDF Portable can scan directly into your pdf file