AFAIK, there are less than a handful of companies that make titanium tubing for bicycle frame usage, frame manufacturers buy the tubing from those companies and weld the tubing to spec. for their frame.
Litespeed was the first and only frame manufacture that made their own shapely titanium tubing back in early 90's, many man-hours involved to shape a single tube.
Ibis was the first frame manufacture to use internally butted titanium tubing for their Ti-Road frame.
Sandvik was the largest titanium tubing manufacture for bicycle frame usage.
All that could have changed nowadays, I think Lynskey also have shaped tubes for their frames.

My workhorse 2001 Litespeed Ultimate has shapely tube, rear wheel cut-out, curved rear stays. I've been riding it since 2004.


I'd like to think that it is the most "shapely" you can get with a mass-produced titanium frame, besides the time trial frame: 2001 Blade