Pointing to ruby-kafka, karafka, racecar and phobos

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Hey, could you please point to following libraries as they are those that are actively maintained:

• ruby-kafka - A Ruby client library for Apache Kafka, a distributed log and message bus. The focus of this library will be operational simplicity, with good logging and metrics that can make debugging issues easier.

• Racecar - A simple framework that integrates with Ruby on Rails to provide a seamless way to write, test, configure, and run Kafka consumers. It comes with sensible defaults and conventions.

• Karafka - Framework used to simplify Apache Kafka based Ruby and Rails applications development. Karafka provides higher abstraction layers, including Capistrano, Docker and Heroku support.

• Phobos - Micro framework and library for applications dealing with Apache Kafka. It wraps common behaviors needed by consumers and producers in an easy and convenient API.

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Ping pretty plz :)