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[2350 users on Ohloh]
Firebug integrates with Firefox to put a wealth of web development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page.
Eclipse Platform Project
[1437 users on Ohloh]
The Eclipse platform is a generic foundation for an IDE. That is, the platform is an IDE without any particular programming language in mind. You can create generic projects, edit files in a generic text editor, and share the projects and files with a Concurrent Versions System (CVS) server. The platform is essentially a glorified version of a file-system browser.
Eclipse Java Development Tools (JDT)
[537 users on Ohloh]
Tags: java eclipse ide
The JDT project provides the tool plug-ins that implement a Java IDE supporting the development of any Java application, including Eclipse plug-ins. It adds a Java project nature and Java perspective to the Eclipse Workbench as well as a number of views, editors, wizards, builders, and code merging and refactoring tools. The JDT project allows Eclipse to be a development environment for itself.
NetBeans IDE
[355 users on Ohloh]
The NetBeans IDE is a free, open-source Integrated Development Environment for software developers. The IDE runs on many platforms including Windows, Linux, Solaris, and the MacOS. It is easy to install and use straight out of the box. The NetBeans IDE provides developers with all the tools they need to create professional cross-platform desktop, enterprise, web and mobile applications.
Eclipse PDT
[242 users on Ohloh]
The PDT project is working towards providing a PHP Development Tools framework for the Eclipse platform. This project will encompass all development components necessary to develop PHP and will facilitate extensibility. It will leverage the existing Web Tools Project in providing developers with PHP capabilities.
[137 users on Ohloh]
jEdit is an Open Source text editor written in Java. It has many useful features, such as syntax highlighting, bracket matching, regular expression searching, multiple file search and replace, folding, and keyboard macros. jEdit also includes a powerful plugin architecture that allows more than 80 plugins to be downloaded and installed from within the editor.
pgAdmin III
[126 users on Ohloh]
Open Source administration and management tools for the PostgreSQL database and derivative products such as EnterpriseDB, Pervasive Postgres and SRA PowerGres. Includes a graphical administration interface, an SQL query tool with grahical EXPLAIN, a procedural code editor, an SQL/shell/batch scheduling agent, Slony-I management and much more. pgAdmin III is designed to answer the needs of most users, from writing simple SQL queries to developing complex databases. The graphical interface support...
[125 users on Ohloh]
Web development software built on Eclipse. Has gotten over 3000 diggs and 1.9 million downloads. Has been called Dreamweaver killer. Has XHTML, CSS, AJAX, Javascript, and FTP support, and many more features. A must have to all web developers!
[117 users on Ohloh]
MonoDevelop is a GNOME IDE primarily designed for C# and other .NET
KDevelop IDE
[107 users on Ohloh]
The KDevelop project was founded in 1998 to build up an easy to use IDE (Integrated Development Environment) for KDE. Since then, the KDevelop IDE is publicly available under the GPL and supports many programming languages.
[95 users on Ohloh]
PHPEclipse integrates full PHP development support in the Eclipse IDE by providing you with editor, code formatter and checker, debugger support and other features.
[86 users on Ohloh]
#develop (short for SharpDevelop) is a free IDE for C#, VB.NET and Boo projects on Microsoft's .NET platform.
CDT (Eclipse)
[85 users on Ohloh]
Tags: c++ eclipse development ide
The CDT is Eclipse's C/C++ Development Tooling project. It is a world class C/C++ IDE that also serves as a platform for others to provide value added tooling for C/C++ developers.
[80 users on Ohloh]
Python Development Environment (Python IDE plugin for Eclipse). Features editor, code completion, refactoring, outline view, debugger, and other goodies - check http://pydev.sf.net)
[63 users on Ohloh]
Code::Blocks is a free, open source, and cross platform IDE. It is being developed in C++ using wxWidgets. Using a plugin architecture, its capabilities and features are defined by the provided plugins.

Code::Blocks is being developed under Windows and Linux. Users have successfully built Code::Blocks under FreeBSD and under Mac OS X.

[51 users on Ohloh]
Geany is a small and lightweight integrated development environment. It was developed to provide a small and fast IDE, which has only a few dependencies from other packages. Another goal was to be as independent as possible from a special Desktop Environment like KDE or GNOME. So it is using only the GTK2 toolkit and therefore you need only the GTK2 runtime libraries to run Geany.
[44 users on Ohloh]
Lazarus is a cross-platform Delphi-Like RAD IDE which uses the Free Pascal Compiler as a backend.
iReport-Designer for JasperReports
[38 users on Ohloh]
iReport is a visual reporting tool based on JasperReports and written in pure Java. You can manage charts, images, sub-reports, etc. Data can be retrieved using JDBC, TableModels, JavaBeans, and XML. It supports output in PDF, XML, XSL, CSV, HTML, and Java2D.
Open Komodo
[38 users on Ohloh]
The OpenKomodo Open Source Development Environment for Dynamic Languages and Web Technologies

The Open Komodo project provides a code base upon which integrated development environment (IDE) software packages can be developed. ActiveState's Komodo Edit 4.3 and later (an open source, multi-platform, multi-language editor) is an established, mature product that uses the Open Komodo platform.

With the Open Komodo Project, the focus is on dynamic languages and the open web. Open Komodo i...

[33 users on Ohloh]
Smultron is a free text editor for Mac OS X 10.4 Tiger which is both easy to use and powerful. It is designed to not confuse newcomers nor disappoint advanced users. It has all the advantages of an Cocoa application and some of its features are tabs, line numbers, support for syntax colouring for many different languages, functions list, support for text encodings, snippets, a toolbar, a status bar, preview, split window, multi-document find and replace with regular expressions, possibility to s...