paulproteus also suggested https://wekan.github.io/ https://wekan.github.io/ and https://kallithea-scm.org/repos/kallithea/ https://kallithea-scm.org/repos/kall

paulproteus also suggested https://wekan.github.io/ https://wekan.github.io/ and https://kallithea-scm.org/repos/kallithea/ https://kallithea-scm.org/repos/kallithea/ and http://repo.or.cz/ http://repo.or.cz/ and http://librelist.com/ http://librelist.com/ and maybe some chat/messaging infrastructure providers that intermediate communications using various different protocols.