clipped from: www.techsupportalert.com One of our editors, Antti Koponen, has personally compiled a huge list of free security software which he has modestly titled "Probably the Best Free Security List in the World"
Whether it is the "best" I cannot say but it is extraordinarily comprehensive and includes many products I didn't even know existed.
Please note that this is just a list not a set of recommendations. However for anyone who has an interest in security it is a fabulous resource.