We need a lister for SourceForge, in order to be able to archive what's there.
Sourceforge uses the Apache Allura forge [1] under the hood to host open source projects.
Unfortunately, the associated REST API [2] does not offer the possibility to list all hosted projects.
A ticket [3] has been created on the subject a couple of years ago but no action have been taken so far.
[1] https://allura.apache.org/
[2] https://sourceforge.net/p/forge/documentation/Allura%20API/
[3] https://sourceforge.net/p/forge/feature-requests/549/