Addon creation

Hello world !

Blender is an amazing piece of software, but it doesn’t cover every small feature users may need. Fortunately, many of these features can be created as add-ons.
Are there any forums, communities, or websites where we can discuss this? I’d like to find out what already exists and what is currently being developed.
It wouldn’t be wise to propose things that already exist.

I appreciate it in advance

Well, this very website has a section for addons: https://blenderartists.org/c/resources/released-scripts-and-themes/50

As for finding out what already exists, I can think of two sites that would just about cover it all: