We have Gnome and Unity for Desktop Browser, for file browser the Gnome default is Nautilus. But if you want to try a sleek and fast GTK3 file manager then Marlin is the answer.  According to Wikipedia, marlin fish are incredibly fast swimmers, reaching speeds of about 110 kilometres per hour (68 mph). So I believe the developer are focusing on Marlin file browser’s speed and simplicity.

Among the main features:

  • tab support
  • Nautilus-like location bar
  • three file view modes: Icon View, List View and Column View
  • networking support (SSH, FTP, Windows share, HTTP and HTTPS)
  • customizable toolbar, including toolbar icon size
  • single click/double click to open file
  • show hidden files
  • zoom in/out

Installation in Ubuntu
Marlin is not yet in the Ubuntu official repositories, but a PPA is available. To install it, open a terminal and type in these commands:

sudo add-apt-repository ppa:marlin-devs/marlin-daily
sudo apt-get update
sudo apt-get install marlin
Conclusion

Personally I prefer Marlin over Nautilus. Maybe the UI is quite simple and compact. Make it easy for me to change view and browse folder. If you want to make it your default file browser, just go Edit menu on Marlin file browser and click preference. Set Marlin as default file manager.