All the languages
Dynamic language expertise for Perl, PHP, Python, Ruby, and Tcl, plus JavaScript, CSS, HTML, and XML, and template languages like RHTML, Template-Toolkit, HTML-Smarty, and Django.

All the tools
Award-winning feature set includes standard editor functionality, plus killer debugging and more. And it's extensible, so you can hack away!

All the team
Source code control integration, a project manager, and multi-user support assist in team development.

Multi-language support: CSS, HTML, JavaScript, XML, Perl, PHP, Python, Ruby, Tcl, RHTML, Template-Toolkit, HTML-Smarty, Django

Autocomplete and calltips

Multi-language file support

Standard editing features

Syntax checking

Syntax coloring

Abbreviations

Vi emulation

Emacs keybindings

HTML preview

Multilingual Input Method Editor (IME) support

Code snippets

Code folding

Multi-document editing

CGI emulation

DBGP debugger protocol

Source code control integration

Code browser

DOM Viewer

HTTP Inspector

Interactive shells

Unit Testing Integration