I’m using three computers with 3 different operating systems (MacOSX, Ubuntu & Slackware) but MacOSX is always my first choice for coding because of the simplicity & beauty of the code editor, personally I prefer Coda or TextMate and recommend them if you can afford. Other than that, there are a lot of nice code editors available that you can try on
1. TextWrangler
TextWrangler is the powerful general purpose text editor, and Unix and server administrator’s tool. It has syntax coloring and function navigation for ANSI C, C++, Fortran, Java, Object Pascal, Objective-C, Perl, Python, Rez, Ruby, Tcl, TeX, and Unix shell scripts. Apart from that, it features automatic language guessing and User selectable per/document language setting for supported languages, integration with Mac OS X developer help and ability to function as an integrated external editor with Xcode.
Link: http://www.barebones.com/products/textwrangler/
2. Aptana
Build web applications quickly and easily using the industry’s leading web application IDE. Aptana Studio harnesses the flexibility of Eclipse and focuses it into a powerful web development engine. Aptana is a great environment to work on small to big projects. It features: HTML, CSS & Javascript code assist, Javascript Debugging, Javascript libraries, Dom outline view, File transfer & synchronization, Live preview.
Link: http://www.aptana.com/
3. Smultron
A text editor which is both easy to use and powerful. It is designed to neither confuse newcomers nor disappoint advanced users. It should work perfectly for a whole variety of needs – like web programming, script editing, making a to do list and so on. Smultron has all open documents in a list with beautiful Quick Look icons to your left just like e.g. iTunes so you can easily switch between many documents – you can also choose to display them as tabs if you prefer it that way.
Link: http://sourceforge.net/projects/smultron/
4. Eclipse
Eclipse is an open source community whose projects are focused on building an extensible development platform, runtimes and application frameworks for building, deploying and managing software across the entire software lifecycle. It is a very well-known & complete development stack for java, php, python, c++ and a lot more.
Link: http://www.eclipse.org/
5. jEdit
jEdit is an open source editor written in Java, that means it can run on almost all modern operating system, include Mac OSX. jEdit features syntax highlight for more than 130 programming languages, it also includes a lot of features for source code editing, search & replace, file management.
Link: http://www.jedit.org/
6. Komodo Edit
Focus on what your code can do; let your editor sweat the details. Komodo Edit, based on the award-winning Komodo IDE, offers sophisticated support for all major scripting languages, including in-depth autocomplete and calltips, multi-language file support, syntax coloring and syntax checking, Vi emulation, Emacs key bindings. Komodo Edit supports PHP, Python, Ruby, Perl and Tcl, plus JavaScript, CSS, HTML and template languages like RHTML, Template-Toolkit, HTML-Smarty and Django.
Link: http://www.activestate.com/komodo-edit
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Some great tips here. I’m currently using Aptana and like it.