Ask HN: Are there any open source projects built with microservice architectures

I've been professionally involved with a couple of microservice implementations now, but they've all been proprietary systems.

Sometimes when asked for advice, I've wished for an open source project with enough activity to get people to understand the scope of some of the decision.

There are probably hundreds of developer focused projects to build/manage microservices, but what I'm really hoping for is some dog food.