I've decided to close the sources of arcsecond.io for now. It's been quite a while since I started to think about it.
Two main reasons. First, the opening of the sources had strictly none of the expected effects, that is, to gather people around the project, even just a few. None. Second, arcsecond.io is a fairly large project, some said too much. And before I find a satisfactory plan of splitting / simplification / whatever, I prefer to make my business on my own.
However, if anyone is interested to really participate, I'll be happy to include him as a member of the GitHub project.