erlang-reltool from devel:languages:erlang:Leap:15 project
Select Your Operating System
Add repository and install manually
For openSUSE Leap 15 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:erlang:Leap:15/openSUSE_Leap_15/devel:languages:erlang:Leap:15.repo zypper refresh zypper install erlang-reltool