Silicon Labs' EM260 ZigBee/802.15.4 Network Processor
The EM260 integrates a 2.4GHz, IEEE 802.15.4-compliant transceiver with a 16-bit network processor (XAP2b core) to run EmberZNet, the Ember ZigBee-compliant network stack. The EM260 exposes access to the EmberZNet API across a standard SPI module, allowing application development on a Host processor. This means that the EM260 can be viewed as a ZigBee peripheral connected over a SPI. The XAP2b microprocessor is a power-optimized core integrated in the EM260. It contains integrated Flash and RAM memory along with an optimized peripheral set to enhance the operation of the network stack.

Texas Instruments' CC2530ZNP Mini Kit 
The CC2530ZNP Mini Kit ZigBee Network Processor development kit is designed to give a simple introduction to ZigBee wireless networks. The hardware consists of a CC2530 ZigBee device preprogrammed with ZigBee software and an MSP430F2274 microcontroller that controls the ZigBee device.

Digi International's Low-Cost XBee
Digi International's low-cost XBee or extended range XBee-PRO are the most advanced ZigBee modules available in the XBee footprint. With advanced mesh networking functionality, they improve data traffic management, allow for greater node density, and allow OEMs to change firmware remotely with over-the-air updates.
View All Digi International's 802.15.4/ZigBee Modules

RFM's ZPM3570 Module
The ZPM3570 from RFM is a low cost, long range, multi-purpose, ZigBee PRO module. It provides a 250 kb/s RF data rate with +20dBm (100mW) RF power coupled with a receive sensitivity of -103dBm to provide exceptional range and performance all in an FCC, IC and ETSI certified module. The ZPM3570 module also includes a 1MB flash memory to accommodate data logging requirements.

Panasonic Zigbee Modules
Panasonic provides Zigbee modules in multiple firmware configurations and antenna options.
View all Panasonic Zigbee Modules

Atmel's AT86RF230
Atmel's AT86RF230 is a low-power 2.4GHz radio transceiver especially designed for ZigBee/IEEE 802.15.4 applications. The AT86RF230 is a true SPI-to-antenna solution.

Silicon Labs Offers Several Different IEEE 802.15.4/ZigBee Solutions
The EM250 is a single-chip solution that integrates a 2.4GHz, IEEE 802.15.4-compliant transceiver with a 16-bit XAP2b microprocessor. It contains integrated Flash and RAM memory and peripherals.

Texas Instrument's CC2533 802.15.4 SoC Solution
Texas Instruments' CC2533 is an optimized system-on-chip (SoC) solution for IEEE 802.15.4 based remote-control systems. It enables single-chip remote controls to be built with low bill-of-material cost when used as a flexible SoC.