The Sun WTK is finally available for Linux again, you may now download the WTK v 2.5.1. The last WTK version which was available for Linux was 2.2, after that WTK was windows-only, and now by popular demand the Linux version is back.

The WTK is the primary tool for JavaME (MIDP) development, i.e. for writing midlets to run on mobile phones.