qrq is an open source Morse code trainer for various platforms and operating systems, similar to the
classic DOS version of Rufz by DL4MM.
It's not intended for learning telegraphy (have a look at http://radio.linux.org.au/ for CW learning
software), but to improve the ability to copy callsigns at high speeds, as needed for example for
contesting.
After starting the software and setting up the parameters (speed, CW waveform...), the program sends 50
amateur radio callsigns. When entering a copied callsign correctly, the speed increases, otherwise it
decreases. Points are awarded for correctly copied callsigns, depending on the speed.
A scoreboard/toplist exists on the author's website, at https://fkurz.net/ham/qrqtop.php. The local
toplist file can be synchronized with the online toplist with qrqscore-d and you can upload your own top
scores by invoking qrqscore-u.