I was going to suggest my $10 solution until you mentioned that you use a MacBook. My software is Windows based.
Workflow:
Canon Raw OR TIFF files from scanner
Lightroom processing
LR/Enfuse exposure and focus stacking
TIFF output
Microsoft ICE stitching & TIFF output
Back to Lightroom for final tweaking

For pure HDR processing, OLONEO Photo Engine worked nicely when I had the early beta/test version. I haven't purchased the commercial product.

Wayne