Chkrootkit!

Kaspersky Lab has developed the TDSSKiller utility that allows removing rootkits.

GMER is an application that detects and removes rootkits .

Rootkit Hunter is a Linux scanner for rootkits, backdoors and local exploits by running tests like:

RootkitRevealer is an advanced rootkit detection utility. It runs on Windows NT 4 and higher and its output lists Registry and file system API discrepancies that may indicate the presence of a user-mode or kernel-mode rootkit. RootkitRevealer successfully detects many persistent rootkits including AFX, Vanquish and HackerDefender.

Vba32 AntiRootkit is designed to analyze the computer for the anomalies that arise due to the presence of malware in the system. Due to this, you will be able to detect and neutralize both the known and unknown viruses that are present in your system in active state. This program is a good assistant in the work of a specialist struggling with complicated infections.

IceSword - Rootkit Indentification Software

Infected with a virus? Unsure whether your existing antivirus software has detected and removed it? Still having problems and unsure where to turn to next? Sophos Virus Removal Tool can help.

Scan for hidden files, registry entries, processes, services, drivers, kernel code patches, ports, operating system service hooks, and Master Boot Record (MBR) rootkits. Clean or remove hidden files, registry entries, and services.