Loncapa seems to be a mature (1992-) piece of GPL software, widely used by
universities to serve online courses. It delivers course materials, aids
communication, does assessment, and federates with other Loncapa servers,
so that educational materials can be shared across the network. There is
an annual "LON-CAPA Workshop and User Meeting" conference.

Details:
https://en.wikipedia.org/wiki/LON-CAPA

It seems to have a release schedule about as frequent as Debian's, and
detailed install instructions for Ubuntu, among others (mostly
Red-Hat-related distros), but no Debian package:
http://install.lon-capa.org/

I have no idea why; possibly there is some reason for a lack of Debian
package? Maybe I have misunderstood something?

Control: reassign -1 wnpp
Control: retitle -1 RFP: loncapa -- federated online course platform

Most likely nobody was ever interested enough to do the required work.

Reassigning to the correct virtual package and with the correct title
format (https://www.debian.org/devel/wnpp/).