In addition to Simpson products, there is also TimberLinx.
They specialize in timber to whatever connections. I do know they sell a 7/8" threaded rod with a re-bar end for either cast-in-place or epoxy applications. The top end uses a wedge based cross piece to anchor the post down.
I have never used the concrete anchor they supply but have used a variation where the rod was welded to an I-beam. Worked well.
Check out their website.