I'm the author of xc.js (https://github.com/fairfieldt/xcjs https://github.com/fairfieldt/xcjs). If you're looking for an equivalent product, xc.js has a big a

I'm the author of xc.js (https://github.com/fairfieldt/xcjs https://github.com/fairfieldt/xcjs). If you're looking for an equivalent product, xc.js has a big advantage over the others listed: it runs natively on iOS (and Android soon). It's a fairly young library, and admittedly has some shortcomings but it would also love some contributions :).