Open Graph Protocol

The Open Graph protocol (OGP) is an open standard developed and controlled by Facebook for expressing the primary subject of an HTML page in custom <meta> tags for the purpose of Facebook showing link previews;

Alternatives

microformats
https://indieweb.org/microformats
Schema.org
https://schema.org/

Redux

Redux is a handy tool for managing state across an application. Although Redux isn’t strictly a Facebook project, it’s very likely had a lot of Facebook resource put into its development.

Alternatives

MobX
https://mobx.js.org
Beedle
http://beedle.hankchizljaw.io/

Yarn

Dependency management for JavaScript. Initially developed by Facebook.

Alternatives

npm
https://www.npmjs.com/