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Website Programming

The W3C HTML Markup Validation Service
Explanation of the error messages for the W3C Markup Validator
The W3C CSS Validation Service
W3C Cheat Sheet is for looking up HTML and CSS codes. Also has Mobile website design tips.
W3Schools - Free HTML, XHTML, CSS, JavaScript, XML, ASP, PHP, SQL tutorials with lots of working examples and source code.
HTML 5 Reference
HTML5 Symbol Codes
HTML ASCII Reference
HTML Codes

Other Programming

Java
Visual C# (and all the other Visual software - C++, Basic, etc.)

Developer Tools (editors/compilers)

NetBeans IDE The NetBeans IDE provides support for several languages (PHP, JavaFX, C/C++, JavaScript, etc.) and frameworks.
Visual Studio Express (for C#, C++, Windows Phone, Java, HTML, Javascript, etc.)
Arachnophilia 5 is a Java based HTML editor that is very flexible and can be modified. It can compile HTML, PHP, Javascript, Java, C++, and a few others. I use version 4 still which is not as flexible but for some reason I like it better (is still available here for download).
Notepad or any other text editor which is available in your StartMenu somewhere.
Visual Studio Express (for C#, C++, Windows Phone, Java, HTML, Javascript, etc.)