How do I straighten UV maps? - Blender Stack Exchange
Jonathan Lampel on Twitter: "Quick #b3d unwrapping tip from the upcoming Pothead character course: Follow active quads on just the straight quads, pin, then unwrap everything else. Works like magic. https://t.co/dAIVgeLH3V" /
Straighten UV island of more complex objects (Blender 2.81a) - Modeling - Blender Artists Community
Straightening UVs without Follow Active Quads - Materials and Textures - Blender Artists Community