Free Protocols Foundation
Independent public forum supporting patent-free protocols. Includes policies, papers, a mission statement, and a list of free protocols.
www.freeprotocols.org Details

IETF Internet Drafts
List of documents organized by alphabetized subjects.
www.ietf.org Details

Internet Encyclopedia
Overview of Internet protocols.
www.freesoft.org Details

Internet2
A consortium led by universities working in partnership with industry and government to develop and deploy advanced network applications and technologies, accelerating the creation of tomorrow's Internet.
internet2.edu Details

Port Numbers and Services Database
Well known port numbers for TCP and UDP, from Internet Assigned Numbers Authority (IANA).
www.sockets.com Details

Protocols.com
Features an overview of various networking and mobile communications protocols, white papers, and links of interest.
www.protocols.com Details

RFC Editor
Collates Request For Comments documents. Explains the RFC process, and includes a searchable database of RFCs.
www.rfc-editor.org Details

RFC Sourcebook
Description of protocols, file formats, glossary of terms, RFCs.
www.networksorcery.com Details

The Internet Report (IETF Weekly Updates)
A table of new Internet Drafts and RFC's that come out each week, with synopses. Archived summaries go back to June 1999.
ietfreport.isoc.org Details