Η team developer of the Linux Mint distribution has published its monthly newsletter detailing the progress it has made in addressing bugs and backporting fixes.
In the bulletin is described and the peer-to-peer file-sharing tool Warpinator, which is now available as a Flatpak to be accessible to people running other Linux distributions.
"We are pleased to announce that Warpinator, a network transfer tool released with Linux Mint 20 and transferred to LMDE 4, is now available for all Linux users as Flatpak. If usesIn Linux Mint 19.x or Linux Mint 18.x open the Software Manager and search for “Warpinator”. 
If you are using another Linux distribution you will find the application as Flathub at
https://flathub.org/apps/details/org.x.Warpinator
The app will help you share archives between computers running different versions of Linux Mint or other distributions. You can use Flatpak and non-Flatpak versions of Warpinator on the same network without any problems.
