telnet client

Multi-platform CVS client.

BitTorrent client.

BitTorrent client with wide-ranging features.

Native Google Music client (unofficial).

Email client focused on speed.

Downloads Web-based mail to a POP client.

Popular BitTorrent client.

Pinboard and Delicious client.

Chat using this RubyCocoa IRC client.

Popular instant messaging client supports a plethora of services.