how to go to STM32 / Arm

The free ones are usable, but most have restrictions and I've found them much harder to use than the Rowley tools (I also use their MSP430 software). Try them and see which you prefer.

I run the LPC2000 Yahoo group for users of the NXP ARM devices:

http://tech.groups.yahoo.com/group/lpc2000/?yguid=293062608