As far as I know flatpak applications can be distributed as a file without the need for a repository, just like .deb or .rpm files

rarbg :(

Soulseek is great for finding and sharing music. I would strongly recommend Nicotine+ over the old SoulseekQt

Not as well curated as rarbg, but a pretty good site

PayPal also supports debit cards which is great for countries where owning a credit card is rare. I don’t own a credit card and I know very few people who do.

One downside of testing is that it isn’t monitored by the Debian security team. Combined with the fact that updates are delayed compared to unstable, it can take many weeks to get important security updates.

I would recommend using a modern, open-source client like Nicotine+. Keep in mind the risks of exposing such a service to the internet (like anti-piracy organizations coming after you in some countries). Don’t download executables. Make sure your media players are up-to-date.

Soulseek is in my opinion a good place to find music that’s hard to find elsewhere. I use it almost daily.