1. Download Meiga from here (only deb packages are available).
2. After you install and open Meiga, you get a window that looks like this:
4. For Local directory choose the directory (folder) you want to share; and for Share as just give it some short name, since you will need to type that name later.
5. That's it. You are now done with the configuration.
6. Now, just go to Share > Copy Invitation and paste that in a text editor.
7. Now go to the other computer (the receiver), open a web browser, and enter the URL from step 6. Basically the URL is http://[local_ip]:8001/[share name]
8. You would now see a list of the contents of the directory, which you can now easily download.
The best highlights of this software are that it is GUI, it does not have to be installed on every machine, and it allows you to share files between Linux and any other OS.