Standard Organizations

Address Supporting Organization (ASO) : ICANN, APNIC, ARIN, RIPE NCC, RADB Routing Registry
American National Standards Institute - ANSI
CERT
Electronic Industries Alliance - EIA
IANA; iana-assignments-port-numbers
ICSA (Firewall Certification)
IEEE
IETF
International Telecommunication Union - ITU
InterNIC
National Institute of Standards and Technology - NIST
Telecommunications Industry Association - TIA

Hardware/Software Vendors

3Com
Anixter Fiber Cabling Solutions
Ascend
Cisco - Software & Support
Computer Associates
Microsoft Windows
Network Associates Inc.
Nortel (Bay) Networks
Novell World Wide
Red Hat Software, Inc.
Sun Microsystems

Forums

ADSL Forum
ATM Forum
Frame Relay Forum
Gigabit Ethernet Alliance
Multiservice Switching Forum

Discussions/Reference

Internet Service Providers Directory
ITPRC - The Information Technology Professional's Resource Center
xDSL-The TeleChoice Report on Online