ProxyList.com

Vicomsoft Firewall and Internet Security Software
FAQs, White Papers, case studies and trial downloads of firewall and filtering software.
www.vicomsoft.com/

DoorStop Firewall
A software firewall providing IP address-based protection for any and all TCP-based services running on your Macintosh.
www2.opendoor.com/

Linux Embedded Appliance Firewall (LEAF)
Embedded Linux network appliance for use in small office and home automation environments; can be used as a gateway, router, firewall or in other ways. (C, C++, Shell script) [GNU/Linux]
leaf.sourceforge.net/

Sentry Firewall CD
Linux-based bootable CD suitable for use as low cost, easy to maintain firewall or IDS node.
www.sentryfirewall.com/

Linux Firewall Howto
Firewall HOWTO collection, ids, nids, hardening, penetration testing, auditing
www.linux-sec.net/

NetBoz Firewall
Working over standard FreeBSD services, provides flexibility, ease of use and performance to corporate networks. NetBoz is a live CD and does not use a hard disk, while all the settings are stored on a write-protectable diskette, making it virtually inmune to intrusions and power failures.
www.netboz.net/

Directory of Software Firewall Reviews
Provides a directory of reviews for software firewalls.
www.consumersearch.com/

Using Term to Pierce an Internet Firewall
Tutorial on using 'term' to do network stuff through a TCP firewall that you're not supposed to be able to, by Barak Pearlmutter.
en.tldp.org/

Extensible Messaging Platform - Anti-Spam Firewall
Software intercepts spam, email-borne viruses, and other objectionable content before reaching your organization's mail server by utilizing complex contextual signatures as opposed to simple keyword lists. [Unix, Windows]
www.jak.com/

Compare & Backup
Backup software that allows one to compare source with destination before backup. FAQs, screenshots, download, and purchase.
www.backupsoft.net/