Based on MozJPEG 3.0.
Usage:
./cjpeg -quality 60 -outfile out.jpg in.png
If colors are smudged:
./cjpeg -sample 1x1 -quality 60 -outfile out.jpg in.png
When generating high-resolution images:
./cjpeg -quant-table 2 -quality 30 -outfile out.jpg in.png
The binary has been compiled for OS X 10.10 and 64-bit Intel.
Compatibility with older systems is ¯_(ツ)_/¯