| CTK | Toolkit for biomedical image computing | Graphics, Widgets, Data | Apache-2.0 | |
| KCompletion | Text completion helpers and widgets | Text, Widgets | LGPLv2.1+ | |
| KConfigWidgets | Widgets for configuration dialogs | Development, Widgets | LGPLv2.1+ | |
| KD Tools | Productivity tools | Widgets, Desktop | Commercial | |
| KDE GUI Addons | Addons to QtGui | Widgets | LGPLv2.1+ | |
| KItemViews | Widget addons for Qt Model/View | Widgets, Development | LGPLv2.1+ | |
| KJobWidgets | Widgets for tracking KJob instances | Widgets | LGPLv2.1+ | |
| KParts | Document centric plugin system | Widgets | LGPLv2.1+ | |
| KTextEditor | Advanced embeddable text editor | Text, Widgets | LGPLv2.1+ | |
| KTextWidgets | Advanced text editing widgets | Text, Widgets | LGPLv2.1+ | |
| KWidgetsAddons | Addons to QtWidgets | Widgets | LGPLv2.1+ | |
| KXMLGUI | User configurable main windows | Widgets | LGPLv2.1+ | |
| LibEngsas | Widgets for technical applications | Widgets | LGPLv2.1+ | |
| Qxt | Utility classes for Qt | Development, Widgets | BSD-3-Clause | |
| Marble | Marble Virtual Globe | Widgets | LGPLv2.1 | |
| Q7Goodies | Windows 7 taskbar extensions | Widgets | Commercial | |
| QDataCube | Datacube for Qt | Data, Widgets | LGPL | |
| QicsTable | High performance Qt table widget | Widgets, Data | GPLV3+, LGPLv2.1+, Commercial, Evaluation | |
| QSint | Open source Qt Widgets Collection | Widgets | LGPL | |
| QTermWidget | Embeddable console widget | Widgets | LGPLv2+ | |
| Qtilities | Building blocks for Qt applications | Logging, Widgets | GPLv3, LGPLv2.1, Commercial | |
| Qwt | Widgets for Technical Applications | Widgets, Graphics | Qwt License 1.0 |