Docutek VRLplus: Product information and free trial.
eLibrarian: Product information and support, from Digi-Net Technologies.
Live, Digital Reference Marketplace: Library Journal article by Buff Hirko reviewing products and companies.
QuestionPoint: Subscription-based collaborative reference service developed by the Library of Congress and OCLC.
Virtual Reference Toolkit: Product information and demonstration from Library Systems and Services. Also includes links to customer libraries.