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https://apps.kde.org/categories/development/ is a more up-to-date list of KDE applications useful to programmers. If you want to contribute to KDE development, see https://community.kde.org/Get_Involved/development

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Development and Programming

Development

KDE delivers not only a desktop environment but also a software ecosystem, providing not only software for regular desktop use, but also tools to create such software. Whether developing for KDE platforms or programming in general or doing even web development, KDE offers programs that can help make any programmer's, or even non-programmer's, life easier and more productive.

Software Development

KAppTemplate
	Generates the basic directory and file structure for a KDE development project.
Kate
	An advanced text editor with many features including syntax highlighting.
RKWard
	RKWard is an easy to use and easily extensible IDE/GUI for R.
Kdesvn
	A client to subversion. It integrates nice in your Desktop and many applications. See footnote
KDevelop
	A powerful and flexible Integrated Development Environment based on KDE technologies. Supports a number of languages such as C, C++, and Ruby.
Kompare
	See the differences between two versions of a text file clearly.
KDiff3
	A viewer to compare or merge 2 or 3 files or directories.
KDbg
	A Graphical Debugger. It provides an intuitive interface for setting breakpoints, inspecting variables, and stepping through code.
KFileReplace
	A very capable multi-line, multi-file, multi-directory find and replace.
KUIViewer
	Display Qt Designer user interface (.ui) files.
Lokalize
	Computer-aided translation system using a paragraph-by-paragraph translation approach when translating documentation.
Plasmate
	Plasma add-ons creator that provides a "mini-IDE" for creating scripted Plasmoids, DataEngines, Runners, etc.
Umbrello
	A diagramming tool for creating models of object-oriented software using UML.
Okteta
	An editor that allows you to look into any file and modify the bytes in it.
KTechlab
	An IDE for microcontrollers and electronics.

Web Development

Quanta+
	A feature-rich web development environment with support for various markup and scripting languages, such as HTML, XML, and PHP.
KImageMapEditor
	An HTML image map editor from KDE.
KLinkStatus
	A link checker from KDE, based in LinkStatus.
KXSLDbg
	A GUI for debugging XSLT scripts

Support for this application can be found from the project's home page