Fission: Serverless on Kubernetes with Soam Vasani - Software Engineering Daily
Serverless Functions for Kubernetes - Fission (fission.io)
Serverless Workflows for Kubernetes | Fission
There is another open source cloud functions platform,
the one that is actual used on Azure public cloud!
Azure/azure-functions-host: The host/runtime that powers Azure Functions @ GitHub
Azure/azure-functions-core-tools: Command line tools for Azure Functions @ GitHub
Azure/Azure-Functions @ GitHub (links)