CC1101 sub-1GHz Transceiver
The CC1101 is a low-cost sub-1GHz transceiver designed for very low-power wireless applications. The circuit is mainly intended for the ISM (Industrial, Scientific and Medical) and SRD (Short Range Device) frequency bands at 315, 433, 868, and 915MHz, but can easily be programmed for operation at other frequencies in the 300-348MHz, 387-464MHz and 779-928MHz bands.

Atmel
ATAKSTK511-9-ND 915MHz Daughterboards (Tx and Rx) for use with STK500

Melexis
EVB7122-433-FSK-C-ND Evaluation Kit for TH7122 433MHz FSK/FM/ASK Single Chip Transceiver (pictured)

Micrel
576-1605-ND RadioWire 902-928MHz Development Kit

Modules for ISM
Modules can help reduce your overall design time by providing a proven RF design, and many provide a complete solution with the networking functionality also programmed into the device.

Tx/Rx ICs for ISM
The ISM bands include 260~470MHz, 902~928MHz and 2.4GHz. An RF Transmitter/Receiver/Transceiver can simplify your design by providing a complete RF solution requiring few external components.

260~470MHz for ISM:
The 260~470 MHz band is an unlicensed band in the US, and specific frequencies are available for use in different countries. Check local regulations for which frequencies are unlicensed for use in your area. In the US this band is controlled by the operation limits specified in CFR Title 47 part 15.231.

View All 260~470MHz: 
Antennas 
Modules, Transmitter, Receiver, and Transceiver ICs

860~960MHz for ISM:
The 860~960MHz band is popular in many countries due to the fact you can send almost any analog or data signal. More specifically, the 902~928MHz band in the US and the 868MHz band in the EU. The 902~928MHz band is an ISM band in the US, but check local regulations to see which frequencies are unlicensed to use in your area.
In the US, this frequency band is regulated by CFR Title 47 Part 15.247.

2.4~2.5GHz for ISM:
The 2.4GHz band is a popular ISM (Industrial, Scientific and Medical) band worldwide. Multiple channels are available depending on your region. Some popular applications used in this band include Bluetooth, WiFi/WLAN, and IEEE 802.15.4-based solutions. This band is limited for operation in the US under FCC CFR Title 47 Part 15.247 and 15.249 (Radiated Power Limits).