wfview is the free one, started in 2018 and licensed under GPL v3, with builds for Windows, macOS and Linux. It draws spectrum and waterfall straight from the radio and puts the controls on screen for Icom IC-7300, IC-705, IC-7610, IC-9700, IC-R8600 and the Kenwood TS-890S. Radios with their own Ethernet port stream receive and transmit audio; a USB only rig like the IC-7300 gets bridged by one copy of wfview running as a server for another. Logging and digital programs tie in through hamlib rigctld or a virtual serial port.
For a ham who reads network settings without flinching, it covers most of what the paid software does and costs nothing. Icom and Kenwood only, though. There is no cloud service in the middle, so ports, tunnels and security are your job, and help comes from the mailing list rather than a support desk.
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