UliPad

Ulipad is a wxPython powered, programmer oriented and flexible editor. It has many features such as class browser, code auto-complete, html viewer, directory browser, wizard and many others.

The most interesting and distinctive feature is the use of mixing technique which makes Ulipad an easy-to-extend programming environment. You can write your own mixings, plugins or simple scripts, and all of them can be integrated in Ulipad in a seamless way.