IntelliJ IDEA

Every aspect of IntelliJ IDEA is specifically designed to maximize developer productivity

Snippet from Wikipedia: IntelliJ IDEA

IntelliJ IDEA is an integrated development environment (IDE) written in Java for developing computer software. It is developed by JetBrains (formerly known as IntelliJ), and is available as an Apache 2 Licensed community edition, and in a proprietary commercial edition. Both can be used for commercial development.