Comment by joeyrobert

Seafile. Locally hosted Dropbox alternative which works well for my needs (300GB+ stored).

Emby. Network media streaming.

qBittorrent with the web server enabled. Downloading Linux ISOs.

Airsonic. Music library streaming, though I find myself using Emby for this more often.

All running on Ubuntu 20.04 on an Intel NUC with 16GB RAM.