SysInfo for Java - This MIDlet will probe several aspects of your MIDP environment and list the results. In particular, it will try to establish a networking connection to check which protocols are available, check several limits of the built-in classes and do some benchmarking on the RMS and the overall device
TaylorBench - A very simple benchmark, that, that tests the low-level performance of a MIDP-compliant device.
The source is open, without any copyright, so you're free to do what you like with it, as long as you acknowledge me in the 'About' Alert