Development

• Anjuta
  Anjuta is a versatile Integrated Development Environment (IDE) for C and C++ on GNU/Linux. It has been written for GTK/GNOME and features a number of advanced programming facilities. These include pr...
  
• Kylix
  Development environment for Borland Delphi/C++ for Linux and Windows. Open version is free. ...
  
• wxHatch
  wxHatch is an IDE for Linux, Solaris, and Windows, built with and for wxWindows users. It generates Makefiles, has a syntax highlighting editor, edits menus, adds wxWindows dialogs and code snippets,...
  
• Titano
  Titano is an IDE for GNOME. Features: * Project managment with automake/autoconf support. * Support for different languages. * Bonobo editor components. * Integrated debugger. * Code exploring ...
  
• Trac
  Trac is a minimalistic web-based software project management and bug/issue tracking system. It provides an interface to the Subversion revision control systems, an integrated wiki, flexible issue tra...
  
• KDevelop
  IDE for C/C++ development on KDE environment, including all features as e.g. syntax highlighting, cvs suppor etc. Primarily for development of Qt/KDE applications ...
  
• UMLet
  UMLet is a lightweight Java tool for rapidly drawing UML diagrams, with a focus on a sound and pop-up-free user interface. ...
  
• gambas
  Gambas is a free development environment based on a Basic interpreter with object extensions, like Visual Basic (but it is NOT a clone !). With Gambas, you can quickly design your program GUI, acc...
  
• Eclipse
  Eclipse is a kind of universal tool platform - an open extensible IDE for anything and nothing in particular. ...
  
• RealmForge GDK
  A cross-platform 3D game development framework and toolkit written in Mono/C# ...
  
• BlueJ
  BlueJ is an integrated Java environment specifically designed for introductory teaching. ...
  
• NetBeans IDE
  NetBeans IDE, the full-featured integrated environment for Java Developers and NetBeans Platform, the widely adopted infrastructure backplane for complex desktop applications. ...
  
• Forest Web Application Builder
  Forest is a Web-based Integrated Development Environment for Web applications. It's in the alpha stage, but you can use it to create your XML files already. ...
  
• KFormDesigner
  KFormDesigner is meant to be Qt Designer replacement for KDE, and to be a simple form designer for non-developers inside Kexi. It provides almost all Qt Designer features (except code entering) and u...
  
• KScope
  KScope is a KDE front-end to Cscope. It provides a source-editing environment for large C projects, such as the Linux kernel. ...
  
• Geany
  Geany is a small and fast editor with basic features of an integrated development environment. Some features: - syntax highlighting - code completion, call tips - folding - many supported filetyp...
  
• Treebeard/Fangorn
  Treebeard is an XSLT IDE that allows you to load an XML file and an XSLT file (from the Web or from the local file system), edit either file, and then perform transformations. ...
  
• Squeak
  Squeak is an open, highly-portable Smalltalk-80 implementation whose virtual machine is written entirely in Smalltalk, making it easy to debug, analyze, and change. The image above was created in Squ...
  
• avrLab
  avrLab is an complete IDE for the AVR microcontroller chips from Atmel. It offers an editor with syntax highlighting which has standard editor commands like copy, cut, paste, goto line, search, and r...
  
• eric3
  eric3 is a full featured Python IDE that is written in PyQt using the QScintilla editor widget. ...
  
• Visual Paradigm for UML (Community Edition)
  Visual Paradigm for UML is a powerful, easy-to-use UML modelling and CASE tool. It lets you draw all types of UML diagrams, reverse source code to UML models, generate source code from UML diagrams, ...
  
• Crusader
  Code Crusader is a graphical Integrated Development Environment (IDE) designed to smoothly integrate the tasks of working with source files, compiling, and debugging, in short everything involved in ...
  
• Placebo
  Placebo is a framework for developing Web-based applications in the PHP scripting language. ...
  
• Drome Engine
  Drome Engine is a 3D game engine written in C++ using OpenGL for graphics rendering. ...
  
• Tcl/Tk Project Manager
  Tcl/Tk Project Manager is a full IDE for programming in Tcl/Tk. It includes a project and file manager, a source editor with syntax highlighting and procedure navigation, a context-sensitive help sys...