The Internet Report (IETF Weekly Updates) -  .

RFC Editor -  .

Active IETF Working Groups - - A directory of the Internet Engineering Task Force groups and their web pages.

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

IETF Internet Drafts - - List of documents organized by alphabetized subjects.

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.

Internet Encyclopedia - - Overview of Internet protocols.

Internet protocols - - General comments on protocol design, and good reference material on a few protocols (especially mail-related; also ftp, time, and misc) by Dan Bernstein.

The Kermit Project - - A protocol that transfers text and binary files without errors between diverse types of computers over potentially hostile communication links, and a suite of communications software programs; Columbia University.

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

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

RFC Sourcebook - - Description of protocols, file formats, glossary of terms, RFCs.

XNS.org - - Independent organization managing the eXtensible Name Service, an open protocol and open-source platform for universal addressing, automated data exchange, and privacy control. Includes an overview, charter, history, and specifications.