Free and open source computing

GNU's Not Unix! - the GNU Project and the Free Software Foundation
Open Source Initiative (OSI)
Software in the Public Interest
OSDN - Open Source Development Network
SourceForge
QuestionExchange
Open Source Jobs (from the OSDN)

Open-Source / Free Software Projects

GNU/Linux

Linux Journal - The Premier Linux Magazine
Linux Online
Linux Documentation Project
Linux Meta-FAQ
Linux Router Project
Linux Firewall Project
Linux Firewall and Security Site

Linux Programming

Distribution specific

Window managers / Desktop environments

KDE - K Desktop Environment
The Official FVWM Homepage
The Official FVWM Themes Home Page
sawfish - an extensible window manager

Shell, mail, and web hosting

DreamHost
Super Dimensional Fortress (freeshell.org)
Web Host Directory
Web Host Directory Forums
Go Daddy Software
mail2web
FastMail - Fast free or paid IMAP webmail with SMTP and POP access

Perl

CPAN - Comprehensive Perl Archive Network

Web development resources

W3C - The World Wide Web Consortium
Juicy Studio, the Developers Choice
BrainJar.com - Experiments in Web Programming
W3Schools Online Web Tutorials
HTML Help by The Web Design Group
Jesse Ruderman's site
irt.org - Internet Related Technologies
The Web Standards Project - Fighting for Standards in our Browsers
HTML/Web Programming Resources (from Sandhills Community College)

CGI

The CGI Resource Index
GNU cgicc - A C++ class library for writing CGI applications
The CGI-LIB Library - An ANSI C Library for CGI Programming
cgi-draw - A Graphics Library For C

ASP

Visual Basic Keywords Included in VBScript (from HTML Goodies)

Other Microsoft stuff

XML

ZVON.org - The Guide to the XML Galaxy
XML.com
The XML Cover Pages

SGML

A Gentle Introduction to SGML

TeX

Introduction to TeX, LaTeX, BibTeX and SliTeX (by the Center for Fluid Mechanics at Brown University)
TeX Resources and Utilities (by the Penn Mathematics Department)

Database stuff

SQL

A Gentle Introduction to SQL
Introduction to Structured Query Language
PostgreSQL
MySQL
Mini SQL (by Hughes Techonologies)
MySQL and PostgreSQL Compared (from PHPBuilder.com)

Object Oriented Programming

Java

Java Programmers FAQ

Self

Self Home Page (by Sun Microsystems)
OpenSelf project
Self Links (by Cetus Links)
self-interest eGroup

Cecil

UW Cecil/Vortex Project

Functional Programming

FAQ for comp.lang.functional

ML

Haskell

Shell Scripting

Bourne Shell Programming

Logic Programming

FAQ for comp.lang.prolog
Logic Programming from the World Wide Web Virtual Library

Prolog

Lisp

Lisp Quick Reference (from Cal Tech CS20)

Pine

Pine Information Center (at the University of Washington)
All About PINE: IMAP, NNTP, & ESMTP FOR UNIX, MS WINDOWS, AND MAC OS X (from ii.com - Infinite Ink)
Use Foreign Accented Characters in Pine

NTP

ntp.org: Home of the Network Time Protocol
NIST Internet Time Service

Miscellaneous Resources

Spybot Search & Destroy
ISO 8859-1 character set overview (by the WDG)
Association for Computing Machinery
dmoz Open Directory - Computers
Opera Software
Programming Languages Index and Glossary
The [Programming] Language Guide
Programming Languages Concepts
The Free Network Project
Unix Guru Universe
Highline Community College; CIS 215 Introduction to UNIX; Orientation Contents
The Art of Assembly Language Programming
Plan 9 from Bell Laboratories FAQ
Gnutella
GNU Emacs on Windows NT and Windows 95/98
PuTTY a free Win32 telnet/ssh client
Tera Term
DShield - Distributed Intrusion Detection System
SSH
Microsoft DLL help database
Microsoft Clip Gallery Live

Vendors

Cables N Mor - Computer Cables and Network Accessories
Off Lease Computer
eCollegePC
Microtel Computer System
Consumer Depot, Major Online Electronics, Computer Surplus Liquidator
SoftwareOutlet.com - Discount Educational Software, Anti-virus, PC Game
cpusurplus.com - Northeast Ohio's largest used computer wholesaler
Explorer Micro, Inc.
X Computing
LINARE - The Global Linux Automation
Lindows.com - Builder Feature Page