While I don't know the name, I do know that many KDE applications can be downloaded through Synaptic, even if you're not using KDE. However, even a simple programme like a clock screensaver might pull in quite a few dependency libraries, so make sure you've got plenty of RAM to handle opening both GNOME/XFCE/FluxBox libraries and KDE libraries, assuming you're not using the KDE version of Mint already, in which case, ignore my blabbering idiocy.
Installation from Synaptic is REALLY straight forward, as simple as "Mark for installation" and "Apply."
"People should better think of their computing devices as facilities lended by the DHS." -Berke Durak, Linux wipe (secure file deletion) development.