Rule Set Based Access Control for Linux
Rule Set Based Access Control, Free Open Source Access Control for Linux
http://www.rsbac.org/

Security Access Controls Inc.
Designs, installs, and maintains access control systems. Provides an integrated approach to access control management. Headquarters in Weston, Ontario, Canada.
http://www.accesscontrols.ca/

Linux Security Protection System (LinSec)
The main aim of the project is to introduce Mandatory Access Control (MAC) mechanism into Linux, based on capabilities, filesystem access domains, IP labeling lists and socket access control.
http://www.linsec.org/

Rule Set Based Access Control (RSBAC) for Linux
Rule Set Based Access Control, Free Open Source Access Control for Linux
http://www.rsbac.de/

Mirage Networks - Network Access Control
Discover how Mirage's full-cycle Network Access Control can protect your network by giving you unprecedented control over who and what accesses your network. You can't control people. Control what's on your network with Mirage NAC.
http://www.miragenetworks.com/

Access Control Technology
ACT specialises in the design and production of superior quality electronic Access Control and Door Entry products for Ireland, UK and Benelux.
http://www.accesscontrol.ie/

Cisco Secure Access Control Server
Provides centralized control for networks of access systems. Site includes documentation.
http://www.cisco.com/go/acs

FreeNAC
FreeNAC is an OpenSource solution for LAN access control, port security and dynamic Vlan management
http://www.freenac.net

Exresource
Provider of IT security and access control systems, specializing in biometric access control.
http://www.exresource.com

Access Control Technologies Inc.
Use a one card solution to control access to copiers, faxes, computers and vending machines while allowing users to complete a prepaid cashless transaction.
http://www.actinc.theshoppe.com/