Not sure if these are all Free.
* ContraVirus - also known as ExpertAntivirus is a fake Spyware, Trojan removal application known to give exaggerated reports of potential risks on a computer.
* IEDefender - A rogue anti-spyware application with aggressive advertising and scare tactics.
* Smitfraud - A computer infection that may display false security alerts or popup messages stating that you are infected with a parasite. Cannot be removed by conventional methods.
* SpyCrush - Part of a group of rogue anti-spyware programs including Spylocked and VirusBurst. Creates system alerts to get users to purchase a full version of the SpyCrush rogue anti-spyware program.
* SpyDawn - A bogus anti-spyware program that may be installed on your computer without you knowing about it. Resembles a legitimate spyware removal programâs interface.
* SpyLocked - A well known bogus anti-spyware program that may be installed onto userâs computer through a previously downloaded Trojan or codec.
* SpyShredder - A dangerous corrupt anti-spyware program that hijacks your PC for malicious purposes. It may infect your machine through Trojans and browser security exploits.
* Trojan.Vundo - A Trojan downloader that generates exaggerated pop-ups on your machineâs screen. May install itself through browser security holes in your computer without your approval.
* VirusProtect - A rogue anti-spyware program which downloads and installs itself onto your PC through a Trojan called Zlob. The Zlob Trojan can be found bundled in video codecs used to view video files, especially with adult content.
* VirusProtectPro - A rogue anti-spyware program that installs itself onto your computer through a Trojan or web security holes. May change your desktop settings, hijack your web browser and redirect you to unwanted web sites.
* Winfixer -Displays false information about the userâs computer, confusing the user into believing that their PC is infected with viruses, spyware and/or other forms of malware. Very similer to programs like WinAntiVirus, WinAntiVirusPro, ErrorSafe, SystemDoctor, WinAntiSpyware, AVSystemCare, WinAntiSpy, Performance Optimizer, StorageProtector, PrivacyProtector etc.
* CoolWebSearch - A rogue anti-spyware program that installs itself onto your computer through a Trojan or web security holes. May change your desktop settings, hijack your web browser and redirect you to unwanted web sites.
* MyWebSearch - MyWebSearch is an adware application which, when initially analysed, was observed to display advertisments when the browser was active
http://frequencysolutions.com/2008/04/worst-spyware-2008/