Spyware Removal Tools:

Adaware: http://www.lavasoftusa.com/

Ad-Aware^® offers you the highest level of protection from known Data-mining, aggressive advertising, Parasites, Scumware, selected traditional Trojans, Dialers, Malware, Browser hijackers, and tracking components. Lavasoft's new Code Sequence Identification (CSI) technology protects you from both known and unknown variants of these threats; and with the real-time protection of Ad-Watch you can block suspicious processes and browser hijack attempts from affecting your system.

Spybot: http://www.safer-networking.org/

Spybot - Search & Destroy can detect and remove spyware of different kinds from your computer. Spyware is a relatively new kind of threat that common anti-virus applications do not yet cover. If you see new toolbars in your Internet Explorer that you didn't intentionally install, if your browser crashes, or if you browser start page has changed without your knowing, you most probably have spyware. But even if you don't see anything, you may be infected, because more and more spyware is emerging that is silently tracking your surfing behaviour to create a marketing profile of you that will be sold to advertisement companies. Spybot-S&D is free, so there's no harm in trying to see if something snooped into your computer, too :)

Spywareblaster: http://www.wilderssecurity.net/spywareblaster.html

SpywareBlaster can help keep your system spyware-free and secure, without interfering with the "good side" of the web.

And unlike other programs, SpywareBlaster does not have to remain running in the background.

Network Security Utilities:

Retina®, PC Magazine Editor's Choice Award winner for vulnerability assessment, identifies known security vulnerabilities and assists in prioritizing threats for remediation. Featuring fast, accurate, and non-intrusive scanning and the industry's most comprehensive vulnerability database, users are able to secure their networks against even the most recent of discovered vulnerabilities. Users can also leverage Retina to enforce internal security policies and standards-based registry settings through custom policy audits. And, because the majority of Retina scan can be conducted without administrator rights, Retina is the easiest scanner to use, and the most cost-effective to deploy.

GFI Languard: http://www.gfi.com/lannetscan/

Automatically detect security vulnerabilities on your network

GFI LANguard Network Security Scanner (N.S.S.) checks your network for all potential methods that a hacker might use to attack it. By analyzing the operating system and the applications running on your network, GFI LANguard N.S.S. identifies possible security holes. In other words, it plays the devil's advocate and alerts you to weaknesses before a hacker can find them, enabling you to deal with these issues before a hacker can exploit them.

Provides in-depth information about all machines/devices

GFI LANguard N.S.S. scans your entire network, IP by IP, and provides information such as service pack level of the machine, missing security patches, wireless access points, USB devices, open shares, open ports, services/applications active on the computer, key registry entries, weak passwords, users and groups, and more. Scan results can easily be analyzed using filters and reports, enabling you to proactively secure your network - for example, by shutting down unnecessary ports, closing shares, installing service packs and hotfixes, etc.

Patch management

GFI LANguard N.S.S. is also a complete patch management solution. After it has scanned your network and determined missing patches and service packs - both in the operating system and in the applications - you can use GFI LANguard N.S.S. to deploy those service packs and patches network-wide. It can also deploy custom software network-wide.

Ethereal: http://www.ethereal.com/

Ethereal is used by network professionals around the world for troubleshooting, analysis, software and protocol development, and education. It has all of the standard features you would expect in a protocol analyzer, and several features not seen in any other product. Its open source license allows talented experts in the networking community to add enhancements. It runs on all popular computing platforms, including Unix, Linux, and Windows.

Kismet: http://www.kismetwireless.net/

Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system. Kismet will work with any wireless card which supports raw monitoring (rfmon) mode, and can sniff 802.11b, 802.11a, and 802.11g traffic.

Kismet identifies networks by passively collecting packets and detecting standard named networks, detecting (and given time, decloaking) hidden networks, and infering the presence of nonbeaconing networks via data traffic.