Apps similar to FLDigi include Ham Radio Deluxe. It's paid, but Logger32 and Digipan are free. Other options are HamBook. In total there are four apps like FLDigi for Windows.
Ham Radio Deluxe (HRD) is an integrated suite of software products for amateur radio. The five modules in the suite provide rig control,logging, digital communications, satellite tracking, and rotator control.
Welcome to Logger32, a 32-bit Amateur Radio logging program written by Bob Furzer, K4CY. Bob is also the author of Zakanaka, and an older 16-bit version of Logger. Logger32 is currently supported to run under Windows 7, 8, 8.1 and 10.
Amateur Radio Freeware Program for PSK31, providing Digital Panoramic Tuning when used with a Windows PC and an amateur bands transceiver
Hambook is a modern general-purpose CAT-control software package for HAM radios targeting the Windows platform. At the time of writing, the application is designed for Yaesu FT-891 but due to the similarities between Yaesu radios, more devices can be added upon request.
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