richcocoa  filed a request to merge staruml  into staruml-2 :
Both provide exactly the same packages. staruml-2 seems to be maintained, and regularly updated, at least for now.
 https://aur.archlinux.org/account/richcocoa/  https://aur.archlinux.org/pkgbase/staruml/  https://aur.archlinux.org/pkgbase/staruml-2/
Request #3169 has been rejected by Muflone :
awaiting for a response from the staruml maintainer. staruml is the first uploaded and it has a better name than staruml-2.