The popular amateur radio software MMTTY, MMSSTV and MMVARI is now open source, enabling anyone to experiment with the code
MMTTY, MMSSTV and MMVARI were originally developed by Mako JE3HHT.
MMTTY supports RTTY, MMSSTV supports Slow Scan Television (SSTV), and MMVARI supports RTTY, PSK, and MFSK.
As of 1st August 2013, all three applications are released to open source development under the LGPL license.
More information - http://mm-open.org/