I love the voice of their help page. Someone very opinionated (in a good way) is building this product. I particularly like this quote: Your data is a liability to us, not an asset. ❧
I’ve been watching that space for a few years. Apparently you saw the same article push them into the broader mainstream consciousness. I would mention Mathematica, but you’re certainly aware of it. There are a few other math-related platforms I’ve used, but I suspect they’re not within the realm you’re looking for.
I’ve seen one or two much smaller projects along the lines of bash_kernel, but they’re either in incredibly rough shape or have very limited scopes or very niche uses. There’s a reasonably interesting list of open science related resources on GitHub, but it’s a tad old and some of the projects on it have merged or changed drastically since it was started. Foster has some interesting material and resources on open science if you care to dig through it. One day I’ll delve into the Open Science Framework to see if they’ve got anything I haven’t seen before too.
I keep meaning to document people who are using their own websites for pieces of this type of thing , but most are doing it in a hybrid fashion. Carl Boettiger is certainly a good example and may be aware of some additional resources including one he helps manage.