Creator of Mullem - a Firefox Add On to create and manage combined feeds for multiple Lemmy communities across any Lemmy instances.
Forum packages have been around for at least 20 years. I’m terms of forum like features the only difference is federation.
I have Ampache running on a self hosted server, which has desktop and mobile apps.
F. is no longer true. They recently removed support for this after lots of people abused the feature.