Unison is a very useful program, which cansynchronize two folders, which can be located on the same computer, or on two different computers. You can also synchronize across a computer running Windows and another running Linux, as Unison system is cross-platform (which makes it, in my opinion, more interesting).
you can easily install from Fedora repositories Unison 2.13, 2.27 and 2.40. However, at page http://www.seas.upenn.edu/~bcpierce/unison/download.html you can notice that the latest stable version is 2.48. I compiled it, and since it works fine on all my Fedora 24 computer, while Unison 2.48 is still missing in the official repositories, I thought to make it available here to who wish use it. Here you find also Ubuntu version (created by alien).
Remember that Unison is licensed under the GNU Public License, as the files that you can download here. I do not provide any guarantee, I just hope it will be useful to you.

rpm for Fedora 24, 64 bit
src.rpm for Fedora
deb for Ubuntu 64 bit