StarUML is an open source project to develop a fast, flexible, extensible, featureful, and freely-available UML/MDA platform running on Win32 platform.

Smultron is a free text editor for Mac OS X Leopard 10.5 which is both easy to use and powerful. It is designed to not confuse newcomers nor disappoint advanced users.

CakePHP enables PHP users at all levels to rapidly develop robust web applications. It is simple and fast to set up with an emphasis on clean code and best practices.

Ruby on Rails is a free web application framework designed to make web development faster, simpler and more efficient. Often shortened to Rails, or RoR, Ruby on Rails is written in the Ruby programming language.

Jaxer is the world’s first true Ajax server. HTML, JavaScript, and CSS are native to Jaxer, as are XMLHttpRequests, JSON, DOM scripting, etc. And as a server it offers access to databases, files, and networking, as well as logging, process management, scalability, security, integration APIs, and extensibility.

Aptana Studio’s community edition is the free, open source Web development environment optimized for use with Ajax libraries and scripting languages like JavaScript, Ruby and PHP. Aptana Studio is considered by many devleopers the best-in-class authoring environment for today’s more rich and interactive Web pages and Ajax applications.

NVU is a Web Authoring System for Linux, Windows and Mac that rivals programs like FrontPage and Dreamweaver. Nvu (which stands for “new view”) allows you to manage and create web pages with no technical expertise or knowledge of HTML.

FlashDevelop is a .NET open source script editor designed mostly for Actionscript 2/3 development. FlashDevelop is very quick to setup and easy to use as an external editor for the Flash IDE or as a complete open source development environment.

swfmill is an xml2swf and swf2xml processor with import functionalities. It’s most common use is the generation of asset libraries containing images (PNG and JPEG), fonts (TTF) or other SWF movies for use with MTASC- or haXe-compiled ActionScript.

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

Amaya is a Web editor/Browser, i.e. a tool used to create and update documents directly on the Web. Browsing features are seamlessly integrated with the editing and remote access features in a uniform environment. This follows the original vision of the Web as a space for collaboration and not just a one-way publishing medium.

Notepad++ is a source code editor and Notepad replacement, which supports several programming languages and runs under the MS Windows environment. Its features include syntax highlighting, WYSIWYG, auto-completion, multi document/view and more.