The Jongleur gem is a process scheduler and manager. It allows users to declare a number of executable tasks as Ruby classes, define precedence between those tasks and run each task as a separate process.

Jongleur is particularly useful for implementing workflows modeled as a DAG (Directed Acyclic Graph), such as ETL or Transactions, but can be also used to run multiple tasks in parallel or even sequential workflows where each task needs to run as a separate OS process.