Projecta: Entries -

QgsAttributeEditorElement - abstract base class for any elements of a drag and drop form
QgsAttributeEditorContainer - container for attribute editors, used to group them visually in an attribute form
QgsAttributeEditorField - element for loading a field's widget onto a form
QgsAttributeEditorRelation - element for loading a relation editor widget onto a form
QgsEditFormConfig - stores and sets configuration parameters for attribute editor forms
QgsFeatureFilterProvider - provides a interface for modifying a QgsFeatureRequest in place to apply additional filters to the request
QgsTracer - provides graph creation and shortest path search for vector layers
QgsTransactionGroup - interface for grouping layers into single edit transactions
QgsUnitTypes - helper functions for various unit types and conversions between units (eg distance and area units)
QgsVirtualLayerDefinition - class for manipulating the definitions of virtual layers
QgsVirtualLayerDefinitionUtils - helper utilities for working with QgsVirtualLayerDefinition objects
Qgs25DRenderer - 2.5D symbol renderer
QgsGeometryGeneratorSymbolLayerV2 - geometry generator symbol layer
QgsFeatureRequest.OrderByClause - class for specifying a field sort order for feature requests
QgsFeatureRequest.OrderBy - a prioritized list of order by clauses for sorting

QgsExternalResourceWidget - widget for displaying a file path with a push button for an "open file" dialog, and optional display of pictures or HTML files
QgsFileWidget - widget for selecting a file or a folder
QgsLegendFilterButton - tool button widget that allows enabling or disabling legend filter by contents of the map
QgsMapCanvasTracer - an extension of QgsTracer that provides extra functionality for interacting with map canvases
Qgs25DRendererWidget - widget for setting properties for a 2.5D renderer
QgsColorWidgetAction - widget action for embedding a color picker inside a menu