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Hello, cofounder of Overleaf here. Just to be clear, open source development of ShareLaTeX is ongoing and indeed has accelerated since Overleaf and ShareLaTeX joined forces. ShareLaTeX is split into many repos, and the one linked above is a 'coordinator' repo that doesn't get updated much. See https://github.com/sharelatex/web-sharelatex for one that is more active. The free version of Overleaf/ShareLaTeX does have a restriction on the number of collaborators: you plus one other. Paid accounts support more collaborators [1], and you can also get more collaborators on the free account by referring others [2]. [1] https://www.overleaf.com/user/subscription/plans [2] https://www.overleaf.com/user/bonus (requires an account)

I use my iPad Pro for taking note taking during lectures and for reading. I would love to be able to use it for LaTeX too, however ShareLaTeX has a bug [0] making it impossible to navigate text using the arrow keys. For programming and other more technical things I do not see any reason to use the iPad. MacBooks are lightweight and more competent machines – the only thing worrying me is Apple's recent lack of interest for macOS and the Mac overall. [0] https://github.com/sharelatex/web-sharelatex/issues/611

DataJoy Co-founder here. A lot of the DataJoy code IS available (https://github.com/sharelatex/web-sharelatex/tree/datajoy). Our other product ShareLaTeX has an open-source version that you can run locally and is very similar to the version we host at sharelatex.com. DataJoy naturally shares a lot of code with ShareLaTeX (if you look at the two products, you'll see they're very similar). However, with DataJoy, we never got the product to a stage where we felt it made sense to invest time into 'good open source' (documentation, installation guides, etc), but the 'code dump open source' version has always been there. The main thing that isn't open source with DataJoy is our backend for running code. At the moment this is so tied into Docker, S3, and how we deploy it in our infrastructure, that I don't think it would be much use to anyone el