Open Source Edition of Obidos is a free version with unlimited user license and no expiration.
It provides all features of Enterprise Edition.
To do a quick installation using docker, use the GitHub repo :
https://github.com/spenego/Obidos-Docker
To compile from sources and install manually, check out the GitHub repo :
https://github.com/spenego/Obidos.
No command line utilities are provided for management of the application.
No Technical Support is provided for Open Source Edition. However, issues can be discussed in the GitHub forum.
If you want to try Standard or Enterprise Edition contact us for a trial license.