Here's a list of free antispyware programs for Mac and Windows. Most freeware is for home use only.
Please read the license agreements when installing freeware programs.

Windows

Ad-Ware Free Antivirus+

- http://www.lavasoft.com/products/ad_aware_free.php
Leaner, meaner, faster. Ad-Aware Free Antivirus+ combines our legendary Anti-spyware with a super fast, free Antivirus.

Malwarebytes

- http://www.malwarebytes.org/products/malwarebytes_free/
Malwarebytes Anti-Malware Free utilizes Malwarebytes powerful technology to detect and remove all traces of malware including worms, trojans, rootkits, rogues, dialers, spyware and more.

SpyBot - Search and Destroy

- http://www.safer-networking.org/
Finds and Destroys spyware, malware, adware and other malicious software.

SUPERAntiSpyware

- http://www.superantispyware.com/
Remove spyware, NOT just the easy ones!

SpywareBlaster

- http://www.brightfort.com/spywareblaster.html
Prevent the installation of spyware and other potentially unwanted software! Simple, effective, trusted.

Apple

MacScan

- http://macscan.securemac.com/
Detects, Isolates & Removes Spyware.

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