JMonkeyEngine 3 SDK
By itself, jMonkeyEngine is a collection of libraries, making it a low-level game development tool. Coupled with an IDE like the official jMonkeyEngine 3 SDK it becomes a higher level game development environment with multiple graphical components. The SDK is based on the NetBeans Platform, enabling graphical editors and plugin capabilities. Alongside the default NetBeans update centers, the SDK includes its own plugin repository and a selection between stable point releases or nightly updates.
Note: The "jMonkeyPlatform" and the "jMonkeyEngine 3 SDK" are exactly the same thing.
Read more about this topic: JMonkey Engine