cocoaModem for Mac

cocoaModem is a MacOS X application which implements modems (modulator-demodulators) for some of the Amateur Radio modulation modes

cocoaModem 2.0 currently supports the following modulation modes and interfaces

• RTTY (AFSK)
  basic RTTY interface
  narrowband two-receiver RTTY interface
  wideband two-receiver RTTY interface
  
  
• PSK
  BPSK31
  QPSK31
  BPSK63
  QPSK63
  
  
• MFSK
  MFSK16
  
  
• Hellschreiber
  Feld Hell
  FM Hell 105
  FM Hell 245
  
  
• CW
  wideband two-receiver CW interface
  
  
• SITOR-B reception
  
  
• HF-FAX reception
  
  
• Synchronous AM reception
  

There is also a basic contest interface in cocoaModem for the RTTY and PSK modes. The contest interface is not meant for serious contesting; it provides a simple interface for casual exchanges in a contest and provides Cabrillo export for a few digital mode contests.

The cocoaModem application is free and can be downloaded here.

Source here.