Flocker vs Kind: What are the differences?

Flocker: Run your databases in Docker and make them as portable as the rest of your app. Flocker is a data volume manager and multi-host Docker cluster management tool. With it you can control your data using the same tools you use for your stateless applications. This means that you can run your databases, queues and key-value stores in Docker and move them around as easily as the rest of your app; Kind: Run local Kubernetes clusters using Docker. It is a tool for running local Kubernetes clusters using Docker container “nodes” It was primarily designed for testing Kubernetes itself, but may be used for local development or CI..

Flocker and Kind can be categorized as "Container" tools.

Flocker is an open source tool with 3.24K GitHub stars and 297 GitHub forks. Here's a link to Flocker's open source repository on GitHub.