Minecraft server with own plugins?

I have a world where I have the server but since I want to expand it I have decided to program my own plugins. Since I just used aternos I wanted to ask if you know what free options and pages there are where you have your own server with world and you can upload / use your own plugins

Mc4u is a good free German hoster

There you can stop by Minehub.de. There are free servers that also run permanently. And there you can also upload your own plugins