An open source OpenPGP compatible encryption system. Provides data integrity services for messages and data files by using digital signatures, encryption, and compression. http://www.gnupg.org/
Freeware for Unix/Linux/FreeBSD/OS2/BeOS/Windows 95/98/ME/NT4. Web proxy that filters banner ads, cookies, and referer tracking. Supports wafers and User-Agent spoofing. http://internet.junkbuster.com/
Free effective anti-virus security solution for systems running Linux; free updates of all signature files and high scanning speed. http://www.bitdefender.com/
Vexira Antivirus for Linux workstations and servers. A complete virus defense system designed for easy and dependable virus prevention on Linux systems. http://www.centralcommand.com
Free Tabular DataStream package. Tabular DataStream is a client-to-database server protocol in SyBase and Microsoft SQL database implementations. http://www.freetds.org/
IPTraf is a console-based network statistics utility that gathers TCP connection paket and byte counts, interface statistics, and activity indicators. Also captures all TCP/UDP packets. http://iptraf.seul.org/
A network scanner that uses spoofed source address packets. Mainly used to test firewall rules and to perform advanced TCP/IP related attacks like the idle scan. http://www.hping.org/
A BSD-based firewall with source included. This binaries main value is that it is perfect for beginners learning how firewalls are developed. http://drawbridge.tamu.edu/