Malwarebytes Anti-Rootkit is a free program that can be used to search for and remove rootkits from your computer.  When started, Malwarebytes Anti-Rootkit will scan your computer and allow you to remove any rootkits that it finds.

Vba32 AntiRootkit is an advanced Rootkit scanner from VirusBlockAda.  This free scanner will search for kernel-mode rootkits, suspicious autoruns, and hidden processes.  VBA AntiRootkit is an advanced tool as it does not perform an automatic scan and removal.  Instead it displays any possible issues, which you will then have to decide how to act upon.

McAfee Labs Rootkit Remover is a free stand-alone product that scans your computer for Rootkits and attempts to remove them.  This version of Rootkit Remover is limited as it only detected and removes the ZeroAccess and TDSS family of rootkits.

Panda Anti-Rootkit is a free rootkit scanner from Panda Security. This program will scan your computer for Rootkits and attempt to remove them.

Trend Micro RootkitBuster is a program that will scan your computer for Rootkits.  This scanner will scan for rootkits that are using the latest technology including Master Boot Record (MBR) infections.

RootRepeal is a rootkit scanner thatRootRepeal is a rootkit scanner that scans for kernel-mode drivers, whether they are hidden, or if the driver file is hidden on disk.  It also has the ability to look for hidden files, hidden process, SSDT hooks, hidden services, and stealth objects.

RootkitRevealer is a rootkit scanner from Microsoft Sysinternals.  This program will search for user-mode or kernel-mode rootkits and list any API discrepancies that are found.

TDSSKiller is a utility created by Kaspersky Labs that is designed to remove the TDSS rootkit. This rootkit is know under other names such as Rootkit.Win32.TDSS, Tidserv, TDSServ, and Alureon. TDSSKiller will also attempt to remove other rootkits such as the ZeroAccess or ZeroAccess rootkit if it is detected.

GMER is a anti-rootkit scanner that searchs your computer for Rootkits on your computer and then allows you to attempt to remove them.

aswMBR is a anti-rootkit scanner that searchs your computer for Rootkits that infect the Master Boot Record, or MBR, of your computer. This includes the TDL4/3, MBRoot (Sinowal), and Whistler rootkits. For this program to properly work it must first download the Avast virus definitions, so you will need an active Internet connection before using it.