Java

• Java SE Docs
• The Jakarta Project
• Maven - Java project management
• Ant Hill - Build server
• Trove - High performance collections for Java.
• javolution
  
  Fast, predictable library: util, lang, io, xml, etc.
• Spring
• Hibernate
• Guice
• java.sun.com
• java.net

Python

• Python
• Python Support For Windows
• Python For Windows Extensions
• Python for .NET

C/C++

• C/C++ Reference
• Programming in C - Unix based.
• GNU libavl
  A library of BSTs implemented in C (AVL, red-black, some threaded).
• Memory Structures Library (MemSL) for C and C++

Web Programming

• Google Web Toolkit (GWT)
• SitePoint Web Reference (HTML, CSS, JavaScript)
• w3schools.com - HTML, XHTML, CSS, etc.
• htmlhelp.com - HTML, CSS, tools, etc.
• Open Source Web Design - website templates.
• Web Developer - A Firefox plugin.
• Mastering Ajax: Part 1 (IBM Developer Works)
  Part 2, Part 3, Part 4
• JavaScript Object Notation - data interchange

Programming Process / Project Management

• Durability of usability guidelines
• Joel On Software
• Mozilla release process
• The Six Laws of New Softare

Other Programming Languages

• Scala
• Groovy
• Gambas
  Graphical development environment based on a Basic interpreter (like Visual Basic).

Algorithms

• Algorithm Study
• The Algorithm Design Manual and The Stony Brook Algorithm Repository
• DADS
  Dictionary of Algorithms and Data Structures

Web Tech

• Apache.org
• Lucene
• Tomcat
• Hadoop

Misc Programming

• Advanced Bash HowTo
• Protocol Buffers
• The Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!)
• Windows 2000 command line commands
• Windows batch file reference - Labmice.net

Books - online

• TechBooksForFree.com
• CVS Book
• Intro to Data Communications - basic networking book.

Misc - non computer related

• LivePlasma.com
  Visual music and movie relationships.
• 101 Essential Freelancing Resources

Security

• Basic Cryptanalysis
• Buffer Overflow - HowTo create and exploit.
• Securing Linux Production Systems
  
  A practical guide to basic security in Linux production environments.
• The Honeynet Project
• Windows XP Hardening Guide
• Windows 2003 Hardening Guide

Tools

• Eclipse - IDE. Java, C, C++, etc.
• GNU Unix Utilities (for windows)
  
  Ports of many common unix utilites to windows. They run native, requiring only the Microsoft C-runtime.
• Nullsoft Scriptable Install System (NSIS)
  
  Installer creation program for windows.
• SysInternals.com - Freeware windows software.
• DNSStuff.com - Handy web-based DNS tool set.

Data Mining, Machine Learning and
Natural Language Processing

• Statistical Data Mining Tutorials
• Introduction to Information Retrieval

Version Control

• Git
• Subversion
• TortoiseSVN

Unix

• Speaking Unix (IBM Developer Works)
  A series of articles on basic unix command line tools.

RFCs

• rfc 2045 - Multipurpose Internet Mail Extensions (MIME)
• rfc 2616 - Hypertext Transfer Protocol -- HTTP/1.1
• rfc 2617 - HTTP Authentication: Basic and Digest Access Authentication
• rfc 2821 - Simple Mail Transfer Protocol (SMTP)
• rfc 2822 - Internet Message Format
• rfc 3629 - UTF-8, a transformation format of ISO 10646
• rfc 3986 - Uniform Resource Identifier (URI): Generic Syntax
• rfc 5335 - Internationalized Email Headers

Misc

• UTF-8 encoding table and Unicode characters
• cert.startcom.org - Free SSL Certificates
• PWNtcha - captcha decoder
• whois.domaintools.com

Picture Archives

• BurningWell.com
• MorgueFile.com
• PropertyShark.com
  Pictures of all buildings in Manhattan.

Interesting Articles

• Five Geek Social Fallacies
• Ganesh Prasad: Open Source-onomics: Examining some pseudo-economic arguments about Open Source
• How a Bookmaker and a Whiz Kid Took On an Extortionist -- and Won
• Languages, Levels, Libraries and Logevity
• LCD round-up with good background discussion of LCD technologies
• Remixing Culture: An Interview with Lawrence Lessig
• So you want to be a consultant?
• Understanding Audio Compression
• Virtual Machines and the OS

NYU Courses I Took

• Open Source Programming
• Information Technology Projects
• Distributed Computing
• Artificial Intelligence
• Networks and Distributed Systems
• Operating Systems
• Fundamental Algorithms