Software Configuration Management
Software Configuration Management techniques and tools for professional software developers.
http://www.swtech.com/configm/

Damon's Thoughts on Software Configuration Management
Damon Poole's take on Software Configuration Management and the state of SCM today.
http://damonpoole.blogspot.com/

Nini
A software configuration library written in 100% C# for the .NET Framework. This software includes a concise API for abstracting the access of multiple configuration types: INI, .NET config files, registry, XML files, and command-line options. [Open source, MIT License]
http://nini.sourceforge.net/

#hackfix project - software configuration guides
hackfix.org
http://www.hackfix.org/software/configure/

Configuration Management Tools Summary
This is part 2 of the Frequently Asked Questions (FAQ) list for the Software Configuration Management (comp.software.config-mgmt) newsgroup. It contains user comments and a list of SCM tools discussed on this newsgroup.
http://www.daveeaton.com/scm/CMTools.html

Sablime Configuration Management System
Configuration management and version control along with flexible MR tracking to manage changes to software, firmware, hardware, and documentation from origination through maintenance, delivery, and support. (commercial) (Lucent Technologies)
http://www.bell-labs.com/project/sablime/

Open Field Communications
Software engineering consultancy specialising in portable solutions HART, Profibus and Foundation Fieldbus configuration. Products include PocketHART, which allows configuration of HART devices from any PocketPC handheld.
http://www.openfieldcommunications.com/

Configuration Data Services, Inc.
Product lifecycle management software including product data mgmt, configuration mgmt, change mgmt, file mgmt, document mgmt, quality control.
http://www.configdata.com

Serena Version Manager
Make your business more productive with the global leader in application development tools - Serena Software. Try our software for free and start today.
http://www.serena.com/

Configuration Manager's Workbench
A family of configuration management utilities providing extensions to SourceSafe. These extensions include change and problem tracking, task tracking, software inventory and release management.
http://www.cm-services.co.uk/cmw_4.htm