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CC2530: FREE IDE for CC2530 development?

Part Number: CC2530
Other Parts Discussed in Thread: Z-STACK

Situation here is:

1, I am using some CC2530 based modules.

2, I have used IAR for 8051 couple years ago, but it was cracked.

3,  I picked Zstack 2.5.1a for coding.

4,SmartRF04EB was used.

I would like to ask:

1, If there is any free alternative for IAR?

2, If there is, does it support Zstack 2.5.1a?