I don't know what you mean by that, so I can't comment. Do you have a link?
If you mean "can I make components for FuelPHP that can be implemented in multiple apps" then the answer is "absolutely".
You can create a package in case you want to add functionality to the framework backend (core functionality) or a module in case you want front-end functionality.
Create basic views for it in a structure that is compliant with the theme class, so the views can be overridden by an app theme to match the look and feel of the application. And include any assets that can be copied to public/assets when you use the module.
All applications we build for our clients are made like this, for 99,9%. The app folder itself only contains a bootstrap controller that deals with the app homepage and the error pages (403/404/5xx).
I mean, that I dont have the possibility to Use Oil(and a Command Line!) Could someone generate an Demo-Module for me and put it on Github or on Bitbucket oder something like this?
I know that, but posting code somewhere isn't going to change that will it?
You asked for examples of what Oil generates, and I pointed you to the docs that have all those examples, and asked you what you want that isn't in there...