Toolkit frameworks are collections of code that can be used across apps and engines. The Shotgun Utilities and QT Widgets frameworks are especially useful in app development.
The Shotgun Utilities Framework, or
tk-framework-shotgunutils, is a collection of Shotgun-related helpers and utilities that make App development easier. It includes a Shotgun (MVC) Model, which makes it easy to connect a Shotgun query with a standard QT View, as well as classes for managing settings, background Shotgun processing, and globals such as schema, statuses, and icons.
The QT Widgets Framework, or
tk-framework-qtwidgets, is a large collection of Shotgun-related QT widgets that make it easy to quickly build a nice looking front-end to your App. It includes multiple custom QT views, delegates, and widgets.