TextMate brings Apple's approach to operating systems into the world of text editors. By bridging UNIX underpinnings and GUI, TextMate cherry-picks the best of both worlds to the benefit of expert scripters and novice users alike. (MacroMates.com Home Page)

TextMate is a simple yet robust text editor that supports a vast array of languages from simple plain text to HTML to ObjectiveC. An application that supports the SVN and Git repositories and supports bundling so you can add your own or other support for other languages or modified languages.

It has the usual set of features like other development tools such as syntax highlighting, auto-correction and code hinting and also has themes so you can style the highlighting the way you want.

It is very lightweight and extremely robust.

TextMate is not an IDE but by using its powerful snippets, macros, and unique scoping system, it can often provide features that even a language specific IDE lacks. It has enough project management features to keep most users happy, but is otherwise kept lightweight with a clean and minimalistic GUI.

Features:

• Ability to Search and Replace in a Project
• Auto-Indent for Common Actions Like Pasting Text
• Auto-Pairing of Brackets and Other Characters
• Clipboard History
• Column Selections and Column Typing
• Completion of Words from Current Document
• CSS-like Selectors to Pinpoint the Scope of Actions and Settings
• Declarative Language Grammars for Graceful Mixing and Hacking
• Dynamic Outline for Working With Multiple Files
• Expand Trigger Words to Code Blocks With Tab-able Placeholders
• File Tabs when Working With Projects
• Foldable Code Blocks
• Function Pop-up for Quick Overview and Navigation
• Plug-able Through Your Favorite Scripting Language
• Recordable Macros With No Programming Required
• Regular Expression Search and Replace (grep)
• Run Shell Commands from Within a Document
• Support for Darcs, Perforce, SVK, and Subversion
• Support for More Than 50 Languages
• Switch Between Files in Projects With a Minimum of Key Strokes
• Themable Syntax Highlight Colors
• Visual Bookmarks to Jump Between Places in a File
• Works As External Editor for (s)ftp Programs
• Works Together With Xcode and Can Build Xcode Projects