The only real option nowadays is SoulSeek. Just make sure you set it up properly. I have seen loads of people mistakenly (I assume) share personal folders. And I am sure some people pry on these.

A couple years ago I was going through this guy’s shared folders because he had a few bits of obscure media I was looking for. Then I ended in a folder containing very personal pictures (family, ids, bank cards). I was actually scared for that guy! I literally found his phone number in the files, and called him to warn him… We are still friends! :D Following this I did two things:

• Spent a whole day looking for people sharing personal info, and warning them.
• Made a folder with files containing fake personal info, fake pictures, etc. I just gave the files names like password.txt, holiday2017.png, etc. Those files were downloaded almost immediately.

For over 3 years I had a torrent that had been stuck at just under 90%. We were 4 more or less 2 over the years. Then I randomly found this guy on soulseek who had the file from the torrent (exact name and size), but it was in private. I messaged him, he wanted to trade (never understood this type of people). Thankfully I had something he wanted. We traded, switched the file in the torrent folder, force check, 100% Motherfuckers! I never kept in touch with that guy, and his precious little file is easily findable on public trackers :D

TLDR - Soulseek