Complete Quads
After downloading the 'Complete Quads.py', open Blender. In Blender navigate to Edit > Preferences > Add-ons then press 'Install...' in the top right. Finally, navigate to wherever you downloaded 'Complete Quads.py' and be sure to checkmark the newly installed add-on.
If proximity merge is enabled, vertices within a range of your selection will be merged if they are within Merge Distance. More often than not made redundant by Blender's built-in fill (fill hotkey is F)
Personally, to help automate certain portions of precision modeling stairs.
Ensure you are on the right version of Blender and that you aren't selecting anything unexpected. Please report any issues through the 'Ask a Question' button on the right, or by sending an email to [email protected]
Feel free to suggest features as well!
Accessible in sidebar (sidebar hotkey is N) or navigate to View3D > Sidebar > Complete Quads