Avast!

Over 100 million registrations and growing - wow...that's a number. Free antivirus for the ordinary Internet user. We have all heard about Avast!

Offers also free antivirus for Android, Linux, Mac - OS X
http://www.avast.com/products#tab2

AVG Free

It's always been our philosophy at AVG that everyone has the right to basic computer security at no charge - and tens of millions of happy users agree. You even get access to a free support forum hosted by AVG.

Avira

Avira AntiVir Personal - FREE Antivirus is a reliable free antivirus solution, that constantly and rapidly scans your computer for malicious programs such as viruses, Trojans, backdoor programs, hoaxes, worms, dialers etc. Monitors every action executed by the user or the operating system and reacts promptly when a malicious program is detected.  Avira AntiVir Personal is a comprehensive, easy to use antivirus program, designed to offer reliable free of charge virus protection to home-users, for personal use only, and is not for business or commercial use.

AxCrypt

AxCrypt is the leading open source file encryption software for Windows. It integrates seamlessly with Windows to compress, encrypt, decrypt, store, send and work with individual files.

We have received 2,510,071 registrations, so it is tried and proven!

AxCrypt is a great complement to services such as Dropbox, Live Mesh, SkyDrive and Box.net .

Features

Password Protect any number of files using strong encryption.

Right-click integration with Windows Explorer makes AxCrypt the easiest way to encrypt individual files in Windows.

BackTrack

The evolution of BackTrack spans many years of development, penetration tests, and unprecedented help from the security community. BackTrack originally started with earlier versions of live Linux distributions called Whoppix, IWHAX, and Auditor. When BackTrack was developed, it was designed to be an all in one live cd used on security audits and was specifically crafted to not leave any remnants of itself on the laptop. It has since expanded to being the most widely adopted penetration testing framework in existence and is used by the security community all over the world.

Badstore

Badstore.net is dedicated to helping you understand how hackers prey on Web application vulnerabilities, and to showing you how to reduce your exposure. Our Badstore demonstration software is designed to show you common hacking techniques. The Badstore demo is GNU open source software.

Balance

Balance is our (still) suprisingly successful load balancing solution being a simple but powerful generic tcp proxy with round robin load balancing and failover mechanisms. Its behaviour can be controlled at runtime using a simple command line syntax.

Balance supports IPv6 on the listening side which makes it a very useful tool for IPv6 migration of IPv4 only services and servers.

Balance successfully runs at least on Linux(386), Linux(Itanium), FreeBSD, BSD/OS, Solaris, Cygwin, Mac-OS X, HP-UX and many more.

32-bit · 64-bit · IPv4 · IPv6 · Open Source · GPL · HP-UX · AIX · BSD · CentOS · Debian · Fedora · FreeBSD · Gentoo · Linux · Mandriva · NetBSD · OpenBSD · OpenSUSE · OS X · Solaris · Ubuntu · Unix · Windows
BASE

- "BASE is the Basic Analysis and Security Engine. It is based on the code from the Analysis Console for Intrusion Databases (ACID) project. This application provides a web front-end to query and analyze the alerts coming from a SNORT IDS system. BASE is a web interface to perform analysis of intrusions that snort has detected on your network. It uses a user authentication and role-base system, so that you as the security admin can decide what and how much information each user can see.

Bcfg2

Bcfg2 helps system administrators produce a consistent, reproducible, and verifiable description of their environment, and offers visualization and reporting tools to aid in day-to-day administrative tasks. It is the fifth generation of configuration management tools developed in the Mathematics and Computer Science Division of Argonne National Laboratory.

BeaEngine

This project is a package with a multi-plateform x86 and x64 disassembler library (Solaris, MAC OSX, AIX, Irix, OS/2, Linux, Windows), tools under windows using this library (LookInside, plugin OllyDbg and ImmDbg), a Length Disassembler Engine (LDE64) and useful links to different documentations.

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