I wrote my own Linux file browser as I didn't like the existing ones.
First a few screenshots:
The overall look:
The bookmarks editor (from right-click menu):
The Quick Edit Mode (QEM):
It's written in Qt5/C++11 and requires Qt 5.6 or later.
What I like most are the quick start, the quick listing of files and the Quick Edit Mode.
If you're interested, prebuilt binaries for Ubuntu 16.10, how to build and other features are on github at: