This addon is bundled with Genie (get it heavily discounted)!

UV+ Is A Fully Procedurally UV Solver

Use the quick viewer to rapidly iterate your unwraps! Includes brand new statistics like efficiency, island count, and bounding edges.

Mess around and find the best unwrap for your object.

UV+ overwrites the native UVMap attribute allowing for instant shader compatibility.

UV+ can be applied at any time so you can further modify your UVs, or... just keep it procedural. Both work :)
I personally like changing seams on the fly.

UV+ has additional code dedicated to keeping the UI clean. Parameters hide and unhide depending on context. This will be a native feature in Blender 4.5 but for now it's novel.

Also some extra features:

• Angular and Conformal mapping.
• Dynamic island packing.
• Live seam editing.
• Plays well with modifier stack.
• Infinite seed variations for random mode.
• Writes onto UVMap attribute (these are the default coordinates).
• Can be added to curves as well (for pipes etc).
• Can be added to text objects.

Settings

Includes the following popular (and new) algorithms:

• Edge Angle - Creates seams in areas with sharp angles (good for hard-surface).
• Random - Creates a set number of islands (good for quick n' dirty unwraps).
• Individual - Splits each face into it's own island (good for fast 'sticky' coordinates).
• Planar - Projects directly from X,Y, or Z (good for terrains, walls, and flat surfaces).
• Box - Finds UV's based on normal direction (good for evenly texturing objects).
• Cylinder - Also known as the Mercator Projection from X,Y, or Z directions (good for maps, and cylindrical objects).
• Sphere - Polar coordinates based on X,Y, or Z poles (good for planets, hdris, etc).

Tutorial

Installation

Install UV+ just like any other addon. Drag the .zip right into Blender and hit confirm. UV+ will then show up in the 3D viewport N-Panel. Make sure to use Blender 4.4 or newer.