The European Commission (EC) has been funding zenodo.org[0] for some years now, which is an open-source publishing platform[1] built on an open-source digital library framework[2]. While its main focus is providing free hosting and serving as a publishing venue for scientific data and results in order to enable reproducibility of the research, it can also be used (by anyone!) to "publish" their research (or just about anything you'd want to publish).
While I guess it's not technically a journal as there's no editorial or review process for what gets published (and absolutely no prestige associated with publishing on it), everything is assigned a DOI number which you could use to uniquely identify it for citation purposes.
The story behind it, as off-handedly told to me by the then-project manager back in 2015 when I was working on it, is that it was created after the EC had mandated that some percentage of EC-funded research results be published in open-access and the instutions which received such funding complained that there existed no proper open-access alternatives for them to publish in.
While I guess it's not technically a journal as there's no editorial or review process for what gets published (and absolutely no prestige associated with publishing on it), everything is assigned a DOI number which you could use to uniquely identify it for citation purposes.
The story behind it, as off-handedly told to me by the then-project manager back in 2015 when I was working on it, is that it was created after the EC had mandated that some percentage of EC-funded research results be published in open-access and the instutions which received such funding complained that there existed no proper open-access alternatives for them to publish in.
[0]: http://about.zenodo.org/
[1]: https://github.com/zenodo
[2]: https://github.com/inveniosoftware