Editor 

EditorUtility

PrefabUtility

AnimationUtility Editor utility functions for modifying animation clips.

GUIUtility

GUILayoutUtility Utility functions for implementing and extending the GUILayout class.

LODUtility.CalculateLODGroupBoundingBox

StageUtility Utility methods related to stages.

EditorJsonUtility

GameObjectUtility

PrefabStageUtility Utility methods related to Prefab stages.

SerializationUtility

SearchUtils Provides various utility functions that are used by SearchProvider.

Engine

GeometryUtility

JsonUtility

TypeUtility

UnsafeUtility Unsafe utility class.

TerrainUtility 

ColorGamutUtility Utility class to query properties of a ColorGamut.

RectTransformUtility

GraphicsFormatUtility

其它