JetBrains has announced Fleet, a new lightweight IDE that can also function as a full-fledged IDE with additional features. Fleet is designed to be polyglot, distributed, and collaborative, allowing developers to work on projects in a variety of languages and environments. The IDE is built from scratch with a new architecture and user interface. Fleet is currently in its early days, and JetBrains is inviting developers to join the Fleet Explorer program to provide feedback and test early releases.