Automatic Propagation Reporter
PSK reporter started out as a project to automatically gather reception records of digimode activity and then make those records available in near realtime to interested parties — typically the amateur who initiated the communication. The way that it works is that many amateurs will run a client that will monitor received traffic for callsigns (the pattern 'de callsign callsign') and, when seen, will report this fact. This is of interest to the amateur who transmitted adn they will be able to see where their signal was received. The pattern chosen is typically part of a standard CQ call. The duplicate check is to make sure that the callsign is not corrupted. The rules for protocols like FT8 are different as the callsigns are protected by error correction. You do still need to call CQ in order for your signal to be reported.
JS8Call is software using the JS8 Digital Mode providing weak signal keyboard to keyboard messaging to Radio Amateurs
JS8Call is an experiment to test the feasibility of a digital mode with the robustness of FT8, combined with a messaging and network protocol layer for weak signal communication on HF, using a keyboard messaging style interface. It is not designed for any specific purpose other than connecting amateur radio operators who are operating under weak signal conditions.
JS8 is also used on 27.245 MHz (USB), and there is where the fun starts if you are not a licence amateur. I've been experimenting with the JS8 mode for a while and the results and distances achieved with a minimum power of 5-12 Watts are really nice.
If you are interested in DX on 11m JS8CALL is really a easy way to make a start.