Institutions

• CUI
• Demon Internet
• Random ISPs: CityScape | Colloquium | WorldsAway
• The Electronic Frontier Foundation
• JANET
• The RFC Editor
• IANA (Internet Assigned Numbers Authority) and IP port numbers
• Seifried's IP port details
• The InterNIC
• The World Wide Web Consortium (W3C)
• Zynet
• ICANN (Internet Corporation for Assigned Names and Numbers)
• Centr (Council for European National Top-Level Domain Registries)
• IANA (Internet Assigned Numbers Authority)
• Network Solutions (.com company)

Writing for the Web

• A Beginner's Guide to HTML
• Client Tools
• GNN Web Tools -- GNNpress
• Java(tm) Home Page
• Microsoft Internet Products
• Microsoft Site Builder Network
• Virtual World-Wide Web [VR]

E-mail

• Electronic communication
• Getting an E-mail Client 
• IMAP VS POP 
• ML - A mail program for X and IMAP
• Mr. Postman @ Internet
• NotifyMail Software
• Pine Information Center
• Pine Mail 
• QUALCOMM 
• Software Review: Z-Mail
• Zmail 
• The UK Mail Managers Archive

HTML

• David Siegel, HTML design
• HTML: Working and Background Materials
• Microsoft Typography Home Page
• Severe Tire Damage
• The Elated Web Toolbox
• GIFbot, demonstrates appearance/size of reduced images
• File Download Time Calculator
• BrowserSizer displays web pages at different screen sizes

Tutorials

• MindFlash tutorial links (courtesy of Mrs Thompson's classroom in Evergreen Union School District)

South Kent College

•  JANET 
• Go2: Guardian OnLine
• Microsoft Internet Products
• SUNS
• Yahoo! Netware
• Yahoo! Windows NT

Search engines

• AllTheWeb.com
• Searchtools.com
• searchenginewatch list

Free products include:

• Swish. Doesn't do PDF.
• Excite for Web Servers (EWS). Doesn't do PDF.
• Lycos site spider

XML

• XML School
• Microsoft's XML developer site
• Extensible Markup Language (XML) 1.0 (W3C Recommendation 10 Feb 1998)

Other

• Sam Spade Tools (DNS, rDNS, etc.)
• TCP port numbers
• Internet FAQ consortium
• Web bug FAQ
• Electronic Privacy Information Centre
• Fortify.net with SSL security checker
• Scamwatch, part of InterGov
• Matt's Script Archive (Perl hit counters, that sort of thing)