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Nicotine+
Nicotine+ is a graphical client for the Soulseek peer-to-peer network.
Nicotine+ aims to be a pleasant, free and open source (FOSS) alternative to the official Soulseek client, providing additional functionality while keeping current with the Soulseek protocol.
Soulseek is a file sharing network for mostly Music but also other files. The most available format for songs are MP3, M4A and FLAC. Almost any song/album is on there so you will have no problem finding what you need. You need to share files yourself otherwise there is a possibility you will get banned. I added a YouTube video tutorial so you can understand it better.
Screenshots:
Downloads are available for:
Soulseek is great although it absolutely requires port forwarding to share files. It's also very much a "desktop" app and I don't think much investment has been made for it to be a solid, containerized server app. Everything I have explored on that front has been very janky.
Not a server solution but it's not a desktop app. On androids there's Seeker that does an excellent job of connecting to the network and downloading what you want.
My basic point stands. It's a shame because the network would be even better if folks could run 24/7 servers easily, like people do with torrents.