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Library components for messages (e.g. displaying Akonadi collections)

KNewStuff

Framework providing components to allow applications to integrate with a KDE Workspace

2D and 3D Graph Calculator

Library which provides support for mail applications

digiKam is an advanced open-source digital photo management application that runs on Linux, Windows, and MacOS. The application provides a comprehensive set of tools for importing, managing, editing, and sharing photos and raw files.

Planet KDE website code and configuration — planet.kde.org

Add-ons for KDE PIM apps (KMail, KAddressBook etc.)

Note-taking application

Library to assist working with IMAP servers

Library that provides cryptography support for mails

KService

Certificate manager and GUI for OpenPGP and CMS cryptography

Various components needed to run a Plasma-based environment

Cross-platform IDE for C, C++, Python, QML/JavaScript and PHP

Tools based on KDE Frameworks 5 to better interact with the system

Syntax highlighting Engine for Structured Text and Code.