Virtual Reference Toolkit  
   Product information and demonstration from Library Systems and Services. Also includes links to customer libraries.
   http://www.vrtoolkit.net/

Convey Systems  
   Interactive Web conferencing systems. Press releases and product information.
   http://www.conveysystems.com/

QuestionPoint  
   Subscription-based collaborative reference service developed by the Library of Congress and OCLC.
   http://www.questionpoint.org/

24/7 Reference  
   Product and services information and customer support.
   http://www.247ref.org/

eLibrarian  
   Product information and support, from Digi-Net Technologies.
   http://elibrarian.digi-net.com/

Live, Digital Reference Marketplace  
   Library Journal article by Buff Hirko reviewing products and companies.
   http://www.libraryjournal.com/index.asp?layout=article&articleid=CA251679&publication=libraryjournal

Docutek VRLplus  
   Product information and free trial.
   http://www.docutek.com/products/vrlplus/