There are a bunch, ~22, of MAXS apps - Main and various Modules. They were “added on” F-Droid most recently on 22 April 2022. The website links are weird - going to a directory list, and the source and issues links go to 404 errors. Apparently the repository/source is actually on bitbucket, according to the Nightlies section on the “homepage”.
Should this be fixed in F-Droid somehow?