ratpoison is hosted on http://savannah.nongnu.org. To see the latest developments in ratpoison go to http://savannah.nongnu.org/projects/ratpoison or visit the ratpoison webpage at http://www.nongnu.org/ratpoison.
There is also a ratpoison mailing list: firstname.lastname@example.org. For details on subscribing and for the list archives go to the ratpoison Savannah project.
There is a #ratpoison IRC channel on the Libera.chat network.