digital modem
fldigi
free software
freebsd
ham radio
linux
mac osx
modem software
ubuntu
windows 2000
windows 7
windows vista
windows xp
FLDIGI – A free Digital modem program for Linux, Free-BSD, OS X, Windows XP, W2K, and Vista
Available on Linux, Free-BSD, OS X, Windows XP, W2K, and Vista. Just sudo apt-get install fldigi on Ubuntu.