WebSphere Studio Device Developer is an integrated development
environment (IDE) that can assist developers in creating Java? 2 Micro
Edition (J2ME?) applications that run on wireless devices such as
cellular phones, PDAs, and handheld computers. It also can be used to
develop and deploy applications to desktop and mobile computers,
automotive infotainment systems, factory automation systems, and
realtime information systems.

Whats new in WebSphere Studio Device Developer Version 5.7:
In addition to the comprehensive IDE and functions provided in previous
releases, WebSphere Studio Device Developer 5.7 contains new tools that
can assist with the extension of existing applications to mobile and
pervasive devices.

http://www-306.ibm.com/software/wireless/wsdd/features.html