Innovative and free publication platform I would like to create an open access journal / a platform that is free of charge for authors and readers. Ideally, I would like it to get away from the current norms: offer the possibility to publish peer-reviewed articles, but also drafts, offer the possibility for reviewers to comment on drafts, offer spaces for videos and audios, and to share parts of our data in order to facilitate the replications of studies. Finally, one part would be devoted to a space where researchers can build knowledge together, like some kind of wiki. 

My question is: do you know anything existing that sounds similar to this?
The currently most complete solution is probably the Open Science Framework, which doesn't yet support peer review but is planning to - and it can be somewhat simulated by using Hypothes.is. Then there are quite a few projects working towards this goal to some extent. Thus, a relevant follow-up question would be: with what reason are you looking for existing projects? To compare, to contribute, or to build upon? That would be relevant to what platforms we could suggest.

(That said, if you want to do some research on your own, I wrote an overview of alternative platforms a while ago.)