The Zolertia Z1 is fully supported in OpenWSN.

The OpenWSN builders build the Zolertia Z1 firmware nightly:

http://builder.openwsn.org/job/Firmware%20Z1/
https://travis-ci.org/openwsn-berkeley/openwsn-fw

The Zolertia Z1 is a commercial product. Please refer to http://www.zolertia.com/products/Z1 for more information about the board, sensors, accessories and ordering information.

Use the Zolertia Wiki for more technical details. 

Components

MSP430F2617 16-bit RISC CPU@16MHz
CC2420 2.4GHz @250kbps Transceiver
CP2102 USB-to-serial from SiLabs
ADXL345 3-axis digital accelerometer
TMP102 Thermometer from Texas Instruments
Embedded Ceramic Antenna from Yageo/Phycomp *An external antenna can be connected too

Datasheets