The Linux Mint developers have have forked Nautilus and are bringing out a new file manager based on it. The move comes after Gnome developers made some controversial changes to Nautilus like removal of dual pane, compact and sidebar views, Go menu etc which some users considered important.
This file manager is named Nemo and is based on Nautilus 3.4.x branch of code. For those willing to give it a try, there is plenty of technical information here which will allow you to pull the code from GIT and compile it on your own machine.
Earlier, Linux Mint devs had forked Gnome 3 to create Cinnamon for bringing in a better desktop experience to users.