I've used it as a replacement for Total Commander on the Mac.
Another posted posted Marta, which I just downloaded and it seems to have almost the same features as Total Commander but in a free/open source offering.
Double Commander seems to be the most popular and featureful among cross-platform two-panel managers. However, its integration with the rest of the system is rather lacking on Mac.
Forklift made some questionable choices in the version 3. The app became much slower.
I've used it as a replacement for Total Commander on the Mac. Another posted posted Marta, which I just downloaded and it seems to have almost the same features as Total Commander but in a free/open source offering.