iSoul, a fork of SolarSeek, is an open-source Mac application for connecting to the SoulSeek peer to peer network. Even though the term 'beta' is sometime used, iSoul is still in its 'alpha' stage and I am bale get hands on it only during my spare time.
Soulseek as a protocol support group chats, individual user chats, browsing of other users files, downloading, uploading, and anything else you might find in other peer to peer networks. Soulseek is great for discovering and downloading hard to find music.
You can download the most recent version of iSoul from the Downloads page.
iSoul is free, open source software hosted at https://github.com/arranger1044/iSoul. If you wish to build iSoul yourself you can do so by cloning the iSoul code to your computer using the Github app for Mac. Once cloned, open the project file in Xcode and issue command+b to build the app or command+r to build and run it.