Useful Open Source Web Designing Tools

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Aptana Studio

Aptana is a complete web development environment that combines powerful authoring tools for HTML, CSS, and JavaScript, along with thousands of additional plugins created by the community

Quanta Plus

Quanta Plus is a highly stable and feature rich web development environment.

Firebug

Firebug is a plugin for Firefox that allows you to edit, debug, and monitor CSS, HTML, and JavaScript live in any web page.

jEdit

jEdit is a cross platform text editor with hundreds of person-years of development behind it.

KompoZer

KompoZer is a complete web authoring system that combines web file management and easy-to-use WYSIWYG web page editing.

Amaya

Amaya is a free, open source web editor and web browser developed by the World Wide Web Consortium (W3C).

CSSED

CSSED is a fully-featured GTK-2 based CSS editor that has a plugin system for utmost extensibility; check out some of the available plugins for CSSED.

OPEN BEXI HTML Builder

Open BEXI HTML Builder is a browser-based open source application for creating HTML web pages. It has a CSS color picker built into the interface and a very simple project management option.