Fldigi is a modem program for most of the digital modes used by radio amateurs today: CW, PSK, MFSK, RTTY, Hell, DominoEX, Olivia, and Throb are all supported. It can help calibrate a sound card to a time signal and do frequency measurement tests to verify accuracy.
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I understand the need to support the work, but I want the option to choose whether I get a bunch of junkware that may hinder my computer.