Finishing up a project at work with Vue right now, and I gotta say it's really excellent to work with. Way more intuitive than some other frameworks out there.
To me it has the advantage that jQuery had, the product if a single developer with a huge community behind him but no large company imposing their agenda on the framework.
When most people talk about React, they aren't talking the single library, but rather, the ecosystem of libraries that enable you to build applications. Most "frameworks" are just a collection of libraries too - the difference is in branding, and most frameworks are really just a pre-built package.json/Gemfile/etc.
yes, weex[1], which is becoming some sort of apache project. it was formerly (?) an alibaba project, not actually sure on the specifics RE: changing of hands.
I looked into this because I remembered weex having a different alibaba site[1]. it looks like weex became an ASF incubator project ~6 mos ago. around the same time, evan you (vue creator) mentioned on twitter (or maybe a github comment, I don't remember) that there is massive development going into weex right now. I would guess it'll be a few more months before we see a solid website with solid docs from ASF.