QRSS is the ultra-narrowband “semi-digital” mode in ham radio: Very slow Morse code with 3 to 60 seconds dot lengths are sent with low power transmitters and “read” from a slow moving spectrum screen. Further information can be found e.g. at https://qrss.org/
Much of the software typically used both to transmit and receive QRSS is open source:
| Project Name | Description | Language | License | Platform |
|---|---|---|---|---|
| QrssPiG | Headless QRSS grabber, supports audio and SDR sources, automated uploads, … | C++ | GNU GPLv3 | Linux |
| LOPORA | GUI QRSS grabber, supports audio and RTLSDR sources | Python | ? | Linux |
| glfer | GUI QRSS grabber, listed for historic reasons only | C, GTK 2 | GNU GPLv2 | Linux |
| FSKView | QRSS grabber with WSPR labeling | C# | MIT | Windows |
TODO