What solutions out there can package software in the native package format? I only found fpm (effing package management) and OBS (Open Build Service) so far.
Edit history:
- 2023-11-02: Change title from "How to package software for many distributions?" to "How to package software for many distributions in their native package format?"
- 2023-11-02: Highlight the word native.
Some native distro formats are unlikely to ever be supported by services of this type. For instance, neither of the two services you list in your opening post will generate Gentoo ebuilds, most likely because the process is fundamentally different: an ebuild is a set of instructions for the package manager, not a prepacked binary.