KPlotWidget is a QWidget-derived class that provides a virtual base class for easy data-plotting. The idea behind KPlotWidget is that you only have to specify information in "data units"; i.e., the natural units of the data being plotted. KPlotWidget automatically converts everything to screen pixel units.

Application framework for file type association and plugin locating.

The goal of KTextTemplate is to make it easier for application developers to separate the structure of documents from the data they contain, opening the door for theming and advanced generation of other text such as code.

Library to help applications in doing conversions of values in different measure units.

Solid is a device integration framework. It provides a way of querying and interacting with hardware independently of the underlying operating system.

Framework for collecting user feedback for applications via telemetry and surveys.