neil 🍄Oooh funkwhale has user libraries and funkwhale is compatible with Subsonic API and Ultrasonic is a Subsonic client app on f-droid that supports offline listening.
This just got very interesting...
Jonkman Microblog is a social network, courtesy of SOBAC Microcomputer Services. It runs on GNU social, version 1.2.0-beta5, available under the GNU Affero General Public License.
All Jonkman Microblog content and data are available under the Creative Commons Attribution 3.0 license.