Texas Instruments Compiler
All of the Chipcon 8051 SoCs are supported by the open source SDCC compiler. But, all you get is a compiler, no examples or demos.

There's no available port of SimpliciTI for SDCC.

There is a port of Contiki, an open source operating system for wireless sensors.
http://processors.wiki.ti.com/index.php/Getting_started_with_Contiki_and_CC2530