There’s Swingmusic and Funkwhale, the former closer to Navidrome, the latter with… nice features (federation, built in library management) and issues (slow development cycle, bugridden Android app).

There’s Technitium DNS, though I’m not an user hence no strong recommendation on my end.

My pick: https://www.merriam-webster.com/dictionary/Chargoggagoggmanchauggagoggchaubunagungamaugg%2C Lake

OP: https://www.merriam-webster.com/wordplay/word-of-the-year

How about PairDrop?

It’s even selfhostable!