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.
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Love this project! The current version (14.1.16) will not work Mac OS X Big Sur (11.0.1), but the beta version (4.1.16.02) seems to work ok. Thanks to the team for addressing this issue so quickly!
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The responsiveness of the Dev Team via groups.io is superior.
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Thank you for a great piece of software, and for the support.
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FLDigi does everything I need for the non-WSJT-X modes. The author is very responsive to bug reports and feature enhancements. Design-wise had to drop it 1 star mainly because the complexity makes the software a little difficult to use/understand and as such the 600+ page manual makes for daunting reading. Mike
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UI is counter-intuitive; the amount of show stopper bugs is huge for a mature piece of software like this. Crashes if a wrong button is pressed.