DomainMOD VS COPS

DomainMOD - Application to manage your domains and other internet assets in a central location. DomainMOD includes a Data Warehouse framework that allows you to import your WHM/cPanel web server data so that you can view, export, and report on your data.

There is also domainMod, but I am not sure if the feature set will be enough for you. Open Source Domain Management Software - DomainMOD

I have run https://github.com/domainmod/domainmod in the past which was perfect for domains, just a shame it doesn't have a section for VPS / hosting accounts.

In the past I have ran https://github.com/domainmod/domainmod and found it to be really good

Check out https://github.com/domainmod/domainmod

I've been looking around for a selfhosted tool where you can add domains on monitor. When the domain get available it should notify me by mail or something so i can buy it myself or for a client. I've found something kinda like this but I don't find any options to monitor domain availability. https://domainmod.org/

You may want to give DomainMOD a look, it's self-hosted and open source, and can be pretty handy for managing a large domain portfolio. I created it to support my personal domain addiction but it's gotten a nice little following over the years, much to my surprise.

This add-on is based on Sebastian Lucas' COPS, updated to work with PHP8.

I started with calibre-web with COPS. It worked fine. Now I use Kavita.

Sounds also like a nice approach too. For me personally an overkill as I only want to copy and read the book I am currently studying. My (calibre) library is synced between my servers and accessible via cops if I really need to search/download a book on the go.

cops - Cops(http://blog.slucas.fr/en/oss/calibre-opds-php-server) by Sébastien Lucas, stands for Calibre OPDS (and HTML) Php Server.

If you're technically literate and don't mind some work, consider setting up COPS on a Raspberry Pi. You'll have a full OPDS server that you can connect to a local wifi network or (with some more work) expose to the full internet. I use this setup as a backup for my Calibre libraries and usually browse them with Yomu or TiReader on an iPad.

I do something similar except I use COPS to host the mobi files and download it via the Kindles web browser. I did switch the theme to a basic black and white theme.