muCommander
Open Source
muCommander is a lightweight, open-source, cross-platform file manager that will run on any operating system supporting Java.
QTTabBar
Free
QTTabBar extends Explorer by tabs and extra folder views.
Compare XtraFinder with alternatives
Compare muCommander and XtraFinder and decide which is most suitable for you.
Compare QTTabBar and XtraFinder and decide which is most suitable for you.