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)..

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..