As mentioned earlier, most of the commercially available open baffle speakers are planars, such as Magnepan, Martin Logan, Quad, Soundlab and so on.
There are a couple of dynamic open baffles from 'proper' manufacturers, notably Genesis, Jamo, Legacy, Nola, and Gradient.
Then there are a few 'semi-pro' like Emerald Physics, Spatial and Tekton.
Salk and Philharmonic Audio have OB midranges, but I wouldn't class them as OB speakers. Proac also did a speaker with an open mid.
And there are many others that veer between being DIY and 'commercial' like Hawthorne.
Plus a few total rip-offs like Lyngdorf, Lotus, Serenity etc.
And then some that are somewhat in between like Wisdom/BG.
Personally, if you want a great sounding open baffle/dipole speaker that just works with no construction/EQ/triamping/hassle, I'd just get a set of Maggie MMGs and a couple of good subs if money is tight, used Maggie 1.6s if you have a bit more, or used Apogees if you are feeling richer and braver.
They won't necessarily sound better than a really good DIY OB like an Orion or LX521, but they will sound better than a DIY OB that hasn't been designed/built/EQed/whatever properly.
After ten years fiddling with my own DIY OBs, there is something rather calming about having speakers that just work with one amp. one cable, no EQ and no occasional mystery absence of treble, mids or bass.