| #develop 
#develop (short for SharpDevelop) is a free IDE for C#, VB.NET and Boo projects on Microsoft's .NET platform. It is open-source, and
you can download both sourcecode and executables
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| Aptana
Aptana is a robust, JavaScript-focused IDE for building dynamic web applications.
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| C# Studio
C# Studio is a simple IDE for a C#/Mono/GTK# developer.
It has a standard "project/editor/output" interface
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| Code::Blocks
Code::Blocks is a free C++ IDE built to meet the most demanding needs of its users.
It is designed to be very extensible and fully configurable.
Built around a plugin framework, Code::Blocks can be extended with plugins. It even
includes a plugin wizard so you can create your own plugins!
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| Dev-PHP IDE
Dev-PHP is a well-featured IDE for PHP. Fast and powerful, it is easy
to use and has a lot of cool features : class browser, scripts preview,
integration with PHP parsers, PHP-GTK library, and Xdebug of course.
Dev-PHP-usb slips even into your pocket.
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| Eclipse 
Eclipse is an open source
community whose projects are focused on building an open development
platform comprised of extensible frameworks, tools and runtimes for
building, deploying and managing software across the lifecycle. A large
and vibrant ecosystem of major technology vendors, innovative
start-ups, universities, research institutions and individuals extend,
complement and support the Eclipse platform.
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| FlashDevelop
FlashDevelop is a .NET open source script editor designed mostly for Actionscript 2 development with seamless swfmill and MTASC integration. 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.
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| Maguma Open Studio
A PHP IDE that includes features for class browsing, ftp support, snippets, debugging and project management.
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| MonoDevelop
MonoDevelop is a free GNOME IDE primarily designed for C# and other .NET languages.
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| NetBeans
All the tools software developers need to create cross-platform Java
desktop, enterprise and web applications. Runs on Windows, Linux,
MacOS, as well as Solaris. It is easy to install and use, works right
out of the box -- and it is open-source and free!
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| Nvu
A complete Web Authoring System that combines web file management and easy-to-use WYSIWYG (What You See Is What You Get) web page editing. |
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| Open Komodo
The Open Komodo Project aims to create a full-featured web development tool for client-side web development |
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| Quanta Plus
A highly stable and feature rich web development environment. |
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| RDT
RDT is an open source Ruby IDE for the Eclipse platform.
Features supported are syntax highlighting, on the fly syntax check,
graphical outline, Test::Unit view/runner, Ruby application launching,
content assist, source formatter, and a Ruby debugger.
A regular expression plugin is also available (Thanks to the EPIC project).
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| Red Hat Developer Studio
Red Hat Developer Studio is a set of plug-ins for the Eclipse IDE. It
extends the Eclipse platform to be an advanced enterprise-level Web
application development environment for leveraging open source, JEE, and
AJAX technologies. By combining visual and source-oriented development
approaches with support for multiple open source technologies, including
JSF, Hibernate, Seam, MyFaces, Spring, and others, Red Hat Developer
Studio enables developers to work easily with many different
technologies all within one environment. Red Hat Developer Studio
provides an extensive collection of specialized wizards, editors, and
views???all of which have been constantly expanding to meet the needs of
enterprise developers to keep pace with rapidly changing business
environments and technologies.
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| Suneido
Suneido is a complete, integrated application platform -
a system for developing and deploying applications without the
frustrations of integrating multiple different products. Suneido
incorporates an object-oriented programming language, client-server relational database software, and application frameworks and components.
It includes the integrated development environment (IDE) used to create
applications as well as the client and server required to run
applications across networks. Suneido is Open Source - it is provided free, with complete source code.
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| Tibco GI Developer Center
TIBCO General Interface™ is an open source project focused on enabling rapid creation of reliable Ajax applications, components and portlets with the look and feel of desktop graphical user interface applications. |
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The List 
