Hello everybody!
I’ve made a very basic app for the Chum. As for now it only lists all available packages*, visualizes package details and has a menu entry to install a package. I haven’t published the sources yet because I think the repo should be in the sailfishos-chum org.
Don’t forget to install sailfishos-chum first!
Please, let me know if this app is in demand. I can’t say I could spend a lot of time on this, but it could be a good start 
* All installed packages are omitted until an update is available - the PackageKit feature.
sailfishos-chum-gui-0.1-1.aarch64.rpm
sailfishos-chum-gui-0.1-1.armv7hl.rpm
sailfishos-chum-gui-0.1-1.i486.rpm