C++ Links

STLport: STLport is a copy of the STL library that works with most C++ compilers
Loki: Loki is a library of flexible design pattern implementations. The companion library to the book "Modern C++ Design", which introduces "Policy-Based" design.
Boost: Boost is a collection of C++ libraries that never made it into the standard.
Some free compilers:
Visual Studio Express Editions
Visual Studio Toolkit 2003
Platform SDK for XP SP2: Microsofts free Visual Studio compilers - Identical to the commercial product. Now Microsoft is oftering the whole product line in an 'express' version, IDE, compilers and all! Free!
Digital Mars Compilers: Digital Mars produces compilers for C,C++,and D. Free versions are available, and the C++ compiler is the fastest compiler (as in the time required to compile something) I've used.
Intel Compilers: Intel produces an optimized vectorizing compiler free for non-profit use. Supports OpenMP.
MinGW: The GCC compiler for windows.
Dev-C++: An IDE for GCC, and other compilers
Code::Blocks: Another free cross-platform IDE.

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Code Links

GameDev: Gamedev.net is full of good articles about game development.
Data and Object Factory: A nice list of design patterns and examples online
Flipcode: Game and demo development articles.
CFXweb: Demo and Game related news
Object Mentor: Information on various aspects of project management and design.
Highlights are the UML tutorials here

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Library Links

libSDL: Simple DirectMedia Layer - a cross-platform multimedia library
tinyXML: tinyXML - a small and easy to use XML library
Microsoft Visual Basic 6.0 Run-Time Library: The libraries required to run VB6 programs
Microsoft win32 Common Controls Library: The library required for running common controls
Open CV: Open Computer Vision library

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Physics Links

Please let me know if you are aware of any additional free, mostly complete, C/C++ physics engines.

AERO: An open source physics engine. Spring and Damper based system.
AGEIA: AGEIA own Meqon and Novodex, and will produce a hardware accelerated physics card.
Bullet Physics Library: A free open source physics engine.
Chrono::Engine: A free non-commercial liscence for win32.
Dynamechs (Dynamics of Mechanisms) Physics Library: An open source physics engine - robotics orientated.
DynaMo: Dynamic Motion library: An open source physics engine
FastCar Library: An open source car and simple rigid body simulation library
Impulse-based dynamic simulation: An open source physics engine
Jiggle Physics: Source code to an experimental physics library. Newer progress in the form of JigLib.
Newton Physics Engine: A free win32 physics engine. (Now also for linux and mac)
Novodex - Game Physics: A free non-commercial liscence for win32. A previously (08/08/04) purely commercial engine.
nV Physics SDK: A free win32 physics engine.
ODE Open Dynamics Engine: An open source physics engine.
OpenTissue: An open source physics library for surgical simulation. Supports deformable objects.
Physics Abstraction Layer: An open source physics abstraction layer: Support multiple physics engines at once
Physsim: An open source physics library - robotics orientated.
Pulsk: An open source physics library - Impulse based Stacking for Non-convex Rigid Bodies
Simple Physics Engine: A free non-commercial liscence for win32, DirectX only.
Springhead simulator: An open source physics engine. (Warning:Japanese, english stub here)
Tokamak Physics Engine: An open source physics engine. Previously (18/05/07) a free win32 physics engine.
True Axis Physics Engine: A free non-commercial liscence for win32.
Some commercial only physics engines:
Havok - Game Physics: Commercial.
Meqon - Game and Simulation Physics: Commercial. Have educational discounts. (Now owned by AGEIA)
Vortex - Simulation Physics: Commercial. Have educational discounts

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Web Links

Opera Web Browser: The opera web browser - Fast, Secure, and feature-rich, available across a number of platforms
Firefox: Firefox is an open source web browser
WDG HTML Validator: HTML Validator, batch mode.
W3C Markup Validation Service: HTML Validator and more.
AnyBrowser: Check your website to see if it supports any browser
StatCounter: Free invisible web tracker
GoDaddy: Worlds biggest .com registrar for a reason
SafariTest: Test your website compatability with the Safari browser
DHTML Color Picker: Find that color, quick!

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Demoscene Links

scene.org: The modern day hornet. All demo-related productions are available here
hornet.org: The oldskool demoscene colletion.
Hugi Magazine: One of the better known demoscene diskmags.
Orange Juice: Demoscene information center.
poet.net: Demo community review site
nullarbor: nullarbor demoparty and game development competition

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General Links

J-Painter: An online java image editor, if you quickly need to scrible something down
gModeler: An online flash UML editor. Great for quickly fleshing out a design on the go
NinjaWords: A fast online dictionary
Process Explorer: A greatly improved version of the windows task manager. Monitors and manages handles, meaning you can remove undersired file locks without a reboot.

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Fun Links

General Links:

PopUrls: Collection of online news sites, a good way to waste your life.
Nuvie - Ultima 6 recreation: An incomplete project rebuilding the Ultima 6 engine, so you can play the game on modern PC's
Home of the Underdogs: This site maintains a massive collection of old games. (you may want to look at a speed limiter here)
Soulseek: Community music sharing network, lots of rare electronica
Nicotine: A cross-platform python implementation for the soulseek client
Soulfind: Soulfind is a Soulseek server implementation for Linux

Comic Strips:

xkcd: The best online comic strip, well, if you fall into the xkcd catagory. A webcomic of romance, sarcasm, math, and language.
Ctrl-Alt-Delete: This is an awesome online commic strip. Very funny if your a gamer. Excellent art work.
Penny Arcade: Another commic strip about gaming. More popular than Ctrl-Alt-Delete, but not as good in my opinion
Dilbert: Dilbert, the comic about work
Krakow: A wierd, yet kindof entertaining commic strip
Monkey Business: This strip is not updated very often anymore, but I find it quite amusing
Mac Hall: Another gaming related strip, but with a greater focus on other aspects such as art, university, and relationships. Very good art work.

Flash Animations:

pwned: A funny flash animation about shoot-em ups (counterstrike)
Salad Fingers: A very wierd cartoon. The animation is pritty good though.
Oldschool demo: A flash animation reminiscent of a c64 oldschool demo
Venus Fly Trap: Saw this at an art gallery once. Fun to play with
The Matrix: Bullet time done in ASCII text