UltraEdit for Mac was officially released this month. A favorite of Windows developers, UltraEdit was first released in 1994 as one of the earliest "Notepad" replacement text editors for programmers on Windows.
When you use your computer for programming, you live in your text editor. Mac developers love TextMate's project management and plug-ins, BBEdit's built-in code validation, or its freeware sibling TextWrangler's fantastic find and replace. For web development, I use Coda with built in syntax highlighting, source code versioning and a CSS editing mode.
