Appliance-based special-purpose hardened Linux distribution with firewall, VPN, anti-virus functionality. Some functionality is available for free for home use, the rest is commercial.

Server distribution from ALT Linux Team. Improved security is achieved with the use of RSBAC, general privilege separation approaches, and certain pieces and ideas from Owl. A beta is available for testing and use.

Small CD-based distribution used for firewalls, routers. System configuration settings are stored on separate floppy disk. Descriptions, news, documents, downloads, links.

Server distribution, goal: provide level of security needed to create corporate web presence or conduct business on Web. Security achieved via included software and using principle of least privilege; available for use.

Server platform using compartmentalization to contain processes to known part of filesystem and network; has system level auditing, supports remote configuration. Mostly closed source. Was commercial product, now discontinued, unsupported.

Distribution designed mainly for security, performance, and to provide users with current, high quality software. All packages optimized for Pentium-class CPUs.

Fed up with costly, complex firewalls, e-gaming firm eBet Ltd., picks open source security; senior systems administrator knew he needed to upgrade from Check Point 4.0 perimeter firewall. [Linux Journal]

Openwall GNU/*/Linux is a server distribution; main means to security: proactive source code review, privilege separation; several other means also used. Available for use. English, French, German, Russian.

Bootable linux live CD-ROM for system and network security testing.

NSA research prototype made public, has modified kernel, several utilities; has enhanced security-related functions designed to show value of mandatory access controls and how such can be added to Linux; not a full OS distribution.

Linux-based bootable CD suitable for use as low cost, easy to maintain firewall or IDS node.

Server distribution; packages chosen based on their security record, safe defaults used. Available for use.