Clusterio
Clusterio allows factorio mods to communicate outside the game. This is the client side mod. To work, it also requires a server side mod located at https://github.com/clusterio/factorioClusterio . It also has the full readme, so head over there.
Another practical side project is the clusterio client, which is a standalone app that makes it easier to connect to clusterio servers. Its still very much WIP at the point of writing and not really recommended.
https://github.com/Danielv123/factorioClusterioClient
Build Instructions
Install Node.js version 10 or later and run npm install then run node build. It will output the
built mod into the dist folder by default. See node build --help for options.