It's crazy how many options there are. Especially with the larger companies offering multiple lines.
I will say, either I have been paying less attention, or they've slowed down a bit. The last one I personally remember surfacing is Joel's after he left Curtis.
I think lots of them make great actions, but the support certainly varies. Bighorn was the first I noticed (of action makers, AI was obviously doing it prior) that highlighted their interchangeability. I think as a result, they have the most options for shops chambering barrels sans action in hand. Impact, Curtis, possibly Lone Peak, and others are making great systems in a similar fashion, but nothing that has tempted me to switch.
It's a good time to be a precision rifle enthusiast.