Some links on your web site are dysfunctional, especially the one leading to the DSGVO information here in this form ...
There is the information that for some actions, the user needs to login, but no point of registration found.
Here in this form, a mail address is to be provided, but no way to edit bug reports, as it then appears as "anonymous".
dev-core.org/backend does not open without J/S
A lot of clicking around to find the content. Would be helpful to have one page per app with changelog, versions, information, links to documentation (file/PDF would be nice) and bugtracker.