Here some freeware tool that can used for edit your code.

TextWrangler 2  - TextWrangler 2 is the powerful general purpose text editor, and Unix and server administrator's tool.

What is a text editor?

At its most basic, a text editor is a tool for simply editing text. You can use a text editor for a wide variety of tasks from cleaning up data, to editing configuration files on your Mac or server, to writing HTML or coding.

Homepage: http://www.barebones.com/products/textwrangler/
Download: TextWrangler 2.3 (10.9 MB)
TextWrangler 2.3 System Requirements
Mac OS X 10.4 or later
Universal Binary (for PowerPC and Intel processors)