EWIDO SECURITY SUITE (Free Version) (new)
Ewido is a trojan scanner that removes trojans, backdoors, worms, keyloggers, dialers and other spyware. It requires Windows 2000 and XP.
a2 Free is an anti-trojan, anti-malware, anti-dialer and anti-worm scanning software. You use it to manually scan your system for malicious software like trojans, dialers, worms, backdoors, denial of service (DOS) tools, keyloggers, sniffers, and the like. It does a scan of processes in memory and the programs stored on your hard disk.
ABTRUSION PROTECTOR PERSONNAL EDITION (new)
Abtrusion Protector tracks the software that you have installed, and only allows those software to run. If some other software (eg, a trojan) somehow creeps into your system (eg, via email attachments), Abtrusion Protector will not allow it to run (unless you give permission).
As such, it serves as a complement to your existing antivirus and anti-trojan programs.
HiJackThis! is a manual utility that can help you detect and remove spyware on your system. Unlike some of the other tools listed on this page, this tool requires you to have some knowledge of what you're looking for, the programs required in your system for it to function properly, and what to remove. It is often a tool that spyware removal experts will ask you to run so that they can diagnose the problem on your system.