Totalfinder 1.10.9 -

This is the "killer feature." It allows you to view two Finder windows side-by-side within a single frame, making file transfers and comparisons incredibly efficient.

For casual users, this may be a dealbreaker due to security concerns. TotalFinder 1.10.9

TotalFinder implements tabs that look and behave like Google Chrome's, which many users find more intuitive and visually distinct than the native macOS versions. This is the "killer feature