Yes. COPS is open source under the GPL-2.0 licence. Its source code is on GitHub at seblucas/cops and is written mainly in PHP.

Yes. COPS is open source, so the software itself is free to use.

Can I self-host COPS?

Yes. COPS can be self-hosted on your own server or infrastructure.

Is COPS actively maintained?

The most recent commit to COPS was on 3 April 2024, and the latest release is 1.1.3, published on 24 June 2019. The project has 1.5k stars on GitHub.

Open source

Calibre OPDS (and HTML) PHP Server : web-based light alternative to Calibre content server

Calibre OPDS (and HTML) PHP Server : web-based light alternative to Calibre content server

What is COPS?: COPS is a calibre OPDS (and HTML) PHP Server : web-based light alternative to Calibre content server.
Is COPS open source?: Yes. COPS is open source under the GPL-2.0 licence. Its source code is on GitHub at seblucas/cops and is written mainly in PHP.
Is COPS free?: Yes. COPS is open source, so the software itself is free to use.
Can I self-host COPS?: Yes. COPS can be self-hosted on your own server or infrastructure.
Is COPS actively maintained?: The most recent commit to COPS was on 3 April 2024, and the latest release is 1.1.3, published on 24 June 2019. The project has 1.5k stars on GitHub.