1. Lerna - https://lerna.js.org/
2. nx - https://github.com/nrwl/nx
3. Turborepo - https://turbo.build/ — Not exactly a monorepo framework
4. Yarn/npm workspaces - https://classic.yarnpkg.com/lang/en/docs/workspaces/

We’ll be going through turborepo since it’s the most relevant one today and provides more things (like build optimisations) that others don’t