The Emsisoft Emergency Kit portable is a very powerful and handy free scanner to bring with you on a USB stick or thumb drive. It can be used to detect and remove trojans, spyware, adware, worms, dialers, keyloggers, and other malign programs. This tool comes with features such as a-squared free, command line scanner, anti-malware, anti-dialer, HiJackFree, and Mamutu.
HouseCall is a Free Portable Antivirus Software developed by Trend Micro. It provides reliable detection and removal of viruses, Trojans, worms, and malware that may reside on your PC. As a standalone antivirus tool, it installs temporary files during launch and removes them upon exit. It works without interfering with any other antivirus or antimalware software installed on your computer.
AVZ AntiViral Toolkit is a portable anti-malware and anti-spyware utility developed by Oleg Zaytsev. Designed to detect and remove adware, spyware, network worms, trojan horses (Trojan, TrojanDownloader, TrojanSpy), and dialers, AVZ also implements specialized algorithms to detect keyloggers, block rootkits, and scan for suspicious system activity. Although originally a standalone toolkit, Oleg later joined Kaspersky, and some of AVZ’s technology is now integrated into Kaspersky products.