NetBeans is a Java IDE that has support for developing Java Mobile applications. NetBeans IDE 6.0 Beta 2 is now available for download. The focus of NetBeans 6.0 is superior developer productivity with a smarter, faster editor, and the integration of all NetBeans products into one IDE.

The NetBeans Java Mobile improvements include:

• New Integrated UI for CLDC/MIDP and CDC development. The
  Mobility pack now supports the project properties previously available
  only for CLDC/MIDP projects. These include project configuration support
  for device fragmentation, integrated obfuscation and optimization
  support, and multiple deployment options, all built on Apache Ant
  for easier coding and management.
• New game builder. Now it’s easier to create mobile games
  with the Mobility Pack’s visual editing support for the MIDP 2.0 Game
  API. The API supports animated sprites and the ability to arrange
  tiled layers into scenes.
• New Visual Mobile Designer. The Visual Mobile Designer
  (VMD) has been re-designed for improved functionality and usability.
• Design analysis. Design Analysis identifies unused
  components for removal from complex visual designs.
• New custom components. New components for the Visual
  Mobile Designer simplify the creation and design of mobile file browsers,
  Short Message Service (SMS) composers, login screens, and Personal
  Information Manager (PIM) browsers.
• New components for Flow Control.
• Generated code is now easier to modify.
• Re-written JSR-172 stub compiler. The new generator
  has support for Base64 type and is able to parse documentation from
  methods.
• Improved project configuration management. A new
  UI for the Project wizard makes it easier to add new project configurations
  for new mobile devices. It’s now easier to create multiple builds
  for multiple configurations.

You can download NetBeans 6.0 Beta 2 at download.netbeans.org