GuideGuide has been saving design time since 2010. During its early days as a free plugin, it was 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.
Bootstrap
Gridism
Neat