Free Code Editor for Windows, Mac and Linux: Komodo Edit for Perl, Python, Tcl, PHP, Ruby, Javascript

Komodo Edit is a fast, smart, free and open-source code editor. You can code for PHP, Python, Ruby, JavaScript, Perl, Tcl, XML, HTML 5, CSS 3, with (customizable) syntax coloring, folding, background syntax checking, and excellent auto-complete and calltips (called "code intelligence").