| Framework Integration | Workspace and cross-framework integration plugins | Desktop | LGPLv2.1+ | |
| KActivities | Runtime and library to organize the user work in separate activities | Desktop | LGPLv2.1+ | |
| KActivitiesStats | A library for accessing the usage data collected by the activities system. | Desktop | LGPLv2.1+ | |
| KCMUtils | Utilities for working with KCModules | Desktop | LGPLv2.1+ | |
| KDBusAddons | Addons to QtDBus | Desktop | LGPLv2.1+ | |
| KDeclarative | Provides integration of QML and KDE Frameworks | Desktop, QML | LGPLv2.1+ | |
| KDED | Extensible deamon for providing system level services | Desktop | LGPLv2.1+ | |
| KDE 4 Libraries | KDE Development Platform | Desktop | LGPLv2.1+ | |
| KDESU | Integration with su for elevated privileges | Security, Desktop | LGPLv2.1+ | |
| KD Tools | Productivity tools | Widgets, Desktop | Commercial | |
| KGlobalAccel | Add support for global workspace shortcuts | Desktop | LGPLv2.1+ | |
| KIdleTime | Monitoring user activity | Desktop | LGPLv2.1+ | |
| KInit | Process launcher to speed up launching KDE applications | Desktop | LGPLv2.1+ | |
| KNotification | Abstraction for system notifications | Desktop | LGPLv2.1+ | |
| KNotifyConfig | Configuration system for KNotify | Desktop | LGPLv2.1+ | |
| KRunner | Parallelized query system | Desktop | LGPLv2.1+ | |
| KWayland | Qt-style API to interact with the wayland-client and wayland-server API | Desktop | LGPLv2.1+ | |
| KWindowSystem | Access to the windowing system | Desktop | LGPLv2.1+ | |
| Plasma Framework | Plugin based UI runtime used to write primary user interfaces | Desktop | LGPLv2.1+ | |
| Purpose | Offers available actions for a specific purpose | Desktop | LGPLv2.1+ | |
| QtitanRibbon | Components for ribbon-style user interfaces | Desktop | Commercial |