Released] Sprite Mask - masking system for Unity Sprite | Page 2 - Unity Forum
GitHub - mob-sakai/SoftMaskForUGUI: UI Soft Mask is a smooth masking component for Unity UI (uGUI) elements.
Depth Mask / Reverse UI Mask for UI staying on screen even when disabled,Depth Mask / Reverse Mask in UI remain transparent even when disabled - Unity Answers