For serious coders, Crimson Editor is a programmer's editor that includes a bunch of features such as syntax highlighting, line numbering support, multitabbing (so that you can open more than one file), project management interface, built in spellchecker, auto-indent and more.
Other useful features are active line highlighting that makes you focus on what you are currently typing and multi-level undo and redo for serious programmers.
If Crimson Editor doesn't suits you for casual HTML programming, you can opt to install AlleyCode HTML Editor or PSPad.
Click here to download Crimson Editor.
Tags: free code editor, freeware, coolware