What started a short list became quite a big description, more details inside the post.
Best Practices for Building a Microservice Architecture. Looks like a wide set of questions covered.
Aritcle about Hexagobal grids with interactive examples
Headset app - a desktop application that turns YouTube into a world class music streaming service
Pigeon - HTTP2-complian Elixir wrapper for sending iOS and Android push notifications
infura.io - a gateway for Ethereum blockhain
reJSON a Redis module that implements ECMA-404 The JSON Data Interchange Standard as a native data type.