Version 6.5.0 of MultiMode has been released. This version adds a color option to the waterfall, and interfacing with SdrDx. You can control the frequency and mode of the SDR directly from MultiMode.
MultiMode allows you to decode and transmit morse code (CW), RTTY, FAX, SSTV, SITOR-B, NAVTEX, PACKET, ACARS, PSK31, ALE, and many other modes on your Macintosh
MultiMode is available for Mac OS X 10.5 and later.
More information about MultiMode is available here:
http://www.blackcatsystems.com/software/cw-rtty-sstv-fax-psk31-packet-decoding-software.htmlAnd the download page is here:
http://www.blackcatsystems.com/download/multimode.html