It appears to have been built by ElemeFE, which I'm assuming is the Frontend dev team of 饿了么 (eleme), a food-delivery company based in Shanghai. I'm happy to see Chinese startups embracing open-source contributions a bit more - feels like a very positive development, especially given the scope of the tech ecosystem there.
On the UI side, this feels very un-opinionated. This could be a good thing or a bad thing. Personally, I'm more drawn to something like Bootstrap or Material UI, where the design choices have already been made, and I can throw together a prototype that looks good enough without actually writing much CSS at all. With this, I feel like I'm going to need to write a lot more CSS to get some kind of reasonably cohesive UI in my application.