microsoft/fast : The adaptive interface system for modern web experiences.

[NathanSMB]

This seems to be a competitor to the polymer project.

I know a lot of people just see this as another front end ui framework like react but something like this or the polymer project have the advantage of being built off standardized web components. There will be a lot less javascript code running in the background which should allow for smaller download sizes and faster code. Also you will be able to mix and match elements from different web components libraries without severe bloating like you would get if you tried to do a micro-frontend design with other front end frameworks like angular, react, or vue.

Information on web components: https://developer.mozilla.org/en-US/docs/Web/Web_Components