• micro-frontends.org - framework agnostic introduction to Micro Frontends.

Components

• Bringing componentization to the web - **must read** that holds true in many aspects even today

Building Blocks

• Custom Element V1 - The Custom Elements V1 API is the most important API you need for building Web Components
• StencilJS - StencilJS is a specific framework for building Web Components declaratively with modern TypeScript.
• unpkg.com - allows for deep-linking into the npm registry and thus to consume components off npm
• Postal.js

Frameworks

• Mosaic - Project Mosaic is Zalando's take on micro frontends and is a complete framework for it.
• single-spa - Canopy's approach on micro frontends is about composing multiple SPAs.
• OpenComponents - _"an open-source, "batteries included" micro frontends framework"_
• Podium - Easy server side composition of microfrontends
• Piral - an open-source framework for next generation portal applications using micro frontends built on React.
• NUT - A framework born for micro frontends, which is used internally in Netease, currently it supports Vue, React and more

Graveyard

• Polymer Project - Google's take on building Web Components won't be used for its upcoming Material Web Components and that says it all

Graveyard

• A Software Architect's Approach... - decision tree, whether you need Micro Frontends (with Web Components)

Other Lists

• Micro Frontends by Elisabeth Engel - closed curated list with tracking links for micro frontends

Books

• Micro Frontends in Action - An early-access book introduction to micro frontend based applications.