Humanoids is a comic book publisher that got its start in Paris, in the early 1970’s. They’re best known for publishing European comic books such as classics like The Incal, but recently they launched a superhero shared universe named H1.
They are also a comic book publisher that has an open submissions policy. You can find their submissions page here; https://www.humanoids.com/divers/pageShow/id/5
Unusually, if you’re a writer, they will allow you to pitch a project even if an artist is not yet attached, although undoubtedly having an artist will increase your chances of a successful pitch.
They ask for 5-10 completed interior pages (if you have an artist) plus a cover.
There is a pitch document you can download from the page telling you how to layout your pitch.
It is also recommended that you look through the books they put out, to see if your pitch matches their style. Their books don’t tend to be mainstream projects, their focus rather being on indie and other unusual stories.