QRadioLink is a Linux software defined radio transceiver application using VOIP for inter-communication, built on top of GNU radio, which allows experimenting with software defined radio hardware using different digital and analog radio signals and a friendly user interface. Its primary purpose is educational, but it can also be customized for low power data communications on various frequency bands. It can also be used as an amateur radio SDR transceiver for demonstrating radio communications
SDR++ is a cross-platform and open source SDR software with the aim of being bloat-free and simple to use. Features Multi VFO Wide hardware support (both through SoapySDR and dedicated modules) SIMD accelerated DSP Cross-platform (Windows, Linux, MacOS and BSD) Full waterfall update when possible. Makes browsing signals easier and more pleasant Modular design (easily write your own plugins)
Trusted QSL keeps eQSL an open and free activity for amateur radio operators. It promotes the Digital Signature Standard (DSS).
Fldigi is a digital modem application for common amateur radio systems. It supports CW, PSK, MFSK, RTTY, Hell, DominoEX, Olivia, and Throb. It also helps calibrating a sound card to a time signal and perform frequency measurement tests. Flmsg is a messaging tool over digital radio, while Flarq supports ARQ file transfers.
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