front ends

Web & mobile:

If we want to be on both desktop & mobile, other than making a responsive web app, or having separate codebases, here are a couple options to explore which would allow to have native mobile apps & a web interface using same code:

https://microsoft.github.io/reactxp/
https://github.com/necolas/react-native-web
https://www.nativescript.org/vue with vue.js

Also see: https://medium.com/javascript-in-plain-english/i-created-the-exact-same-app-in-react-and-vue-here-are-the-differences-e9a1ae8077fd

Mobile:

https://flutter.io/

Back & front-end:

https://docs.feathersjs.com/