Are there companies that allow to be free when learning and teaching?
What you describe is pretty close to a university professorship. We are paid to learn and teach. We go to conferences and present our work there, as well as work with colleagues. We don't normally have strict no-compete clauses, though teaching for two different universities isn't normally allowed. Courses we develop can be used by others in many cases, online or otherwise. 

You would need to pick your field, however, since technology in itself is a pretty narrow subject. Study for a doctorate is normally quite theoretical in most fields, but there are programs, likely in engineering, that focus more on technology. 

Companies in industry have different rules. Normally they want to create a product and are focused on that. There are education-focused companies of course. However, most such companies have strict no-compete rules, some of them attempting to bind you for life. This is especially true if you learn proprietary material as part of your job. Also, the "normal" work day has expanded to the point where you likely just want to have a life in the time that you aren't "on the job". 

University professors, too, are always at work, but the work they are always at is normally thinking. 

Locally, you might want to visit Arts et Métiers ParisTech, and talk to one or more of the professors there.