Yes, there are others, Klog, xlog, pyqso... but CQRLOG is my favorite for functionality and being a good team-player with some many rigs and other apps. Yes, it's free. Not a demo or hookware, but completely free.
CQRLOG comes from https://www.cqrlog.com/ where you can download the app, but maybe most important, easy instructions how to get started.
Should you go to the CQRLOG site and get the very latest version? If you are very familiar with Linux, maybe it's fun to play with the "bleeding edge" and chase down dependencies. For ordinary mortals using Mint, Ubuntu, Debian or a derivative, there are my favorite 3 commands to put into a terminal (ctrl-alt-T) that will install the most up-to-date version that is supported by your installation, and fix a couple of the more common reasons a new installation doesn't work right first time.. Red Hat, Fedora, Suse use your app installer. Arch nerds, go to the AUR and download up-to-date source and enjoy compiling. All CQRLOG code is at https://github.com/ok2cqr/cqrlog/releases/
So to install CQRLOG on a Debian or derivative like Ubuntu or Mint, open a terminal with ctrl-alt-T and type each of these on a new line, followed by the Enter key.:
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sudo apt install cqrlog
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sudo apt install mariadb-client mariadb-server
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sudo usermod -a -G dialout <username>
The setup is mostly obvious. You put in your callsign where it says callsign, etc. The manual for config and operation is at: https://www.cqrlog.com/help/index.html
Anything else? It likes new versions of hamlib, versions 4.3 or best, 4.5. Usually not a problem unless you have a very old Linux.
Now enjoy CQRLOG with its automatic reading of your rig frequency, mode, and integration with LoTW, Clublog, eQSL, QRZ and more. Other apps i regularly use and automatically link to it include WSJT-X, JS8call, QSSTV, Fldigi, WFview...