Adware and spyware scanner, with real time protection.

Free 100% Real-Time Protection is included in Spyware Terminator basic version, an essential function most other applications charge you extra for. Effectively remove spyware, adware, trojans, keyloggers, home page hijackers and other malware threats.

Safe Quarantine
Suspect files found during the scan are moved into Quarantine. Spyware Terminator prevents them from functioning and causing further damage to your computer. You can review and choose to permanently remove suspect files or safely store essential files.

Easy to Use
Spyware Terminator lets people of all skill levels detect and eliminate spyware. If you remove a program by mistake, you can easily put it back.

Manual & Scheduled Scan
Scan your computer manually or schedule an in-depth scan to be performed on a regular basis. The scan process runs in the background so that you will not be disrupted while working on other tasks.

Automatic Update Downloads
Spyware Terminator can be set to automatically download updates, ensuring the most effective protection for your computer.

There had been some rather negative discussions online about Spyware Terminator and it's ties to Crawler, but this was clarified and dispelled at Spyware Warrior (you can read the posting here).
Also some may chose not to use the integrated Clam AV that is an option with ST.