Humans plugin intended for automatic creation of humans.txt, see humanstxt.org/ Plugin provides route /projects/:id/humans.txt with project description and list of members. Note, however, that it ignores project access settings and always available.
The newest version is always at GitHub.
Follow the Redmine plugin installation steps at: www.redmine.org/wiki/redmine/Plugins Make sure the plugin is installed to vendor/plugins/redmine-humans