United States

• Association of Research Libraries
• Center for Library Initiatives
• CLASS
• OCLC
• Research Libraries Group
• SOLINET
• WLN

Library-Related Companies

• ALISE (Latvian ILS vendor)
• BIOSIS
• CARL
• CAS (Chemical Abstracts Service)
• Data Research Associates
• Dialog
  (Now a service of Knight-Ridder Information)
• EBSCO Information Services
• Engineering Information
• Faxon
  (Now a Dawson Company)
• Geac
• Innovative Interfaces
• Mead Data Central (Lexis and Nexis)
  (Now a member of the Reed-Elsevier PLC Group)
• Notis
  (Now Ameritech Library Services - Academic Division)
• Personal Bibliographic Software
• SilverPlatter
• SIRSI
• UMI
• VTLS
• WLN

Here is a map to library gopher servers.