| ZyXEL Security products include gateway and firewall appliances. | |
| Zone Labs, Inc. Developers of ZoneAlarm, a free, dynamic, application-level personal firewall, and of TrueVector technology for real-time Internet traffic information and control. Includes a profile, product range, support, and online purchasing. | |
| Zimocom Korean security appliance developer including high speed firewalls, VPN solutions, central management servers and virus protection. | |
| Xtradyne's Firewall Domain Boundary Controller Includes a SOAP firewall (Web Services DBC) and a CORBA firewall (iiop DBC) both available on Windows, Linux and Solaris. The DBC suite enables end-2-end security by performing message analysis, authentication, authorization and auditing. | |
| Xnet Solutions Manufactures rack mount firewall appliances and related network equipment. | |
| WyvernWorks Firewall Freeware downloadable firewall for Windows PC's includes intrusion detection and prevention and trojan handling. | |
| WYAE IT Security Software Open source security software for dumping firewall configurations and monitoring traffic through them. Software details and downloads. | |
| Workable passive FTP connections through a firewall A general article on enabling passive FTP connections through a firewall. Examples used in the article discuss the APF firewall and Pure-FTPD ftp server. | |
| Winproxy by Ositis Software Network Address Translation, firewall, and modem sharing. Runs on Windows NT/95/98. Recently purchased by Blue Coat. | |
| Whale Communications eGap application firewall as well as SSL and VPN solutions. Company and product information, customer case studies, press articles and partner program. | |
| webScurity Inc. webApp.secure web application firewall solution. Company and product information, press articles and contact details. | |
| WatchGuard Technologies ICSA certified Firebox plug-and-play security appliances. Providing firewall, VPN, NAT, user authentication and web access control. | |
| Visualize Intrusion Analysis Supplies freeware and shareware logfile analyser and reporting utilities like VisualICE for BlackICE Defender and VisualZone for ZoneAlarm and ZoneAlarm Pro. | |
| Visiq Technologies Offer focussed security applaince solutions for small to medium businesses. Based in the Leeds, UK | |
| Vicomsoft Firewall Q&A A whitepaper on relevant firewall questions and answers. The knowledge of this subject relates to firewalls in general use, and stems from NAT and proxy firewall technology experience. Welcomes feedback and comments from any readers on the usefulness or c | |
| Vicomsoft Firewall and Internet Security Software FAQs, White Papers, case studies and trial downloads of firewall and filtering software. | |
| TuxGuardian An application-based personal firewall for Linux | |
| tummy.com, ltd. Linux-based firewalls and IsinGlass, is a script meant to make the average user's Linux machine more secure when connected to the Internet, for example, when dialing up via a local ISP. | |
| Tufin Technologies Provides the SecureTrack application for firewall policy change management, auditing, analysis and compliance. [Requires Javascript to view site] | |
| Trustix AS Developers of the XSentry firewall and Trustix Secure Linux. Security science and research. | |
