Azkaban!

RunDeck is an open source automation service with a web console, command line tools and a WebAPI. It lets you easily run automation tasks across a set of nodes.

Airflow is a platform to programmaticaly author, schedule and monitor data pipelines.

Oozie is a workflow scheduler system to manage Apache Hadoop jobs.

The purpose of Luigi is to address all the plumbing typically associated with long-running batch processes. You want to chain many tasks, automate them, and failures will happen. These tasks can be anything, but are typically long running things like Hadoop jobs, dumping data to/from databases, running machine learning algorithms, or anything else.