PeerStreamer 1.0 for Mac was available as a free download on our software library. This free software for Mac OS X is a product of Drupal. The program relates to Audio & Video Tools.
From the developer:
PeerStreamer is an open source P2P Media Streaming framework written in C, developed as part of the NAPA-WINE European research project. It includes a streaming engine for the efficient distribution of media streams, a source application for the creation of channels and a player applications to visualize the streams.
You may want to check out more Mac applications, such as Oplayera, Machinima Respawn or Jenny FM, which might be related to PeerStreamer.