We need a lister for SourceForge, in order to be able to archive what's there.
Sourceforge uses the Apache [[ https://allura.apache.org/ | Allura forge ]] under the hood to host open source projects.
Unfortunately, the associated [[ https://sourceforge.net/p/forge/documentation/Allura%20API/ | REST API ]] does not offer the possibility to list all hosted projects.
A [[ https://sourceforge.net/p/forge/feature-requests/549/ | ticket ]] has been created on the subject a couple of years ago but no action have been taken so far.
**Update (2020-10-22):** thanks to a Slashdot/SourceForge contact we know have a decent plan for a SourceForge lister, see update by @zack below.