Requirements: Photoshop CC, CC 2014, CC 2015
Web Site: http://guideguide.me/
GuideGuide is the Photoshop panel that makes working with guides painless.
GuideGuide has been saving design time since 2010. It’s Photoshop’s most installed extension.
Add guides based on the canvas, artboards, selected layers, or your selection.
Quickly add guides to edges and midpoints.
Clear canvas, artboard, horizontal, vertical, or specific guides.
Duplicate guides to other artboards and documents.
Create custom grids that are too complex for other grid tools.
Save the grids you use the most and share them with others.
What's New in Version 4.3.3
Fixed: A bug that caused selection-based grids to be misaligned when the default ruler was not px.