Library components for messages (e.g. displaying Akonadi collections)
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.)
Library to assist working with IMAP servers
Library that provides cryptography support for mails
Certificate manager and GUI for OpenPGP and CMS cryptography
Various components needed to run a Plasma-based environment
Tools based on KDE Frameworks 5 to better interact with the system
Syntax highlighting Engine for Structured Text and Code.