Blender add-on with some extended functionality for working with UV-Maps.
Add-on web-page: https://b3d.interplanety.org/en/uv-int-add-on/
Current version: 1.0.1
In the current version it has 2 buttons:
“Seam” - makes seam directly on UV-Map
“Weld” - merge points on UV-Map, stitch seams
“Seam by edge” - seam a UV-Map along the edges, without “blasting” the points on the cutting line