WSJT-X (JT65 + JT9)
http://physics.princeton.edu/pulsar/k1jt/wsjtx.html

JT65-HF-HB9HQX-Edition
https://sourceforge.net/projects/jt65hfhb9hqxedi/

The JT65 Communications Protocol (Joe Taylor, K1JT)
http://www.arrl.org/files/file/18JT65.pdf
http://physics.princeton.edu/pulsar/k1jt/