btrfs-assistant from home:ColonelPanic project
Select Your Operating System
Add repository and install manually
For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:ColonelPanic/openSUSE_Tumbleweed/home:ColonelPanic.repo zypper refresh zypper install btrfs-assistant