HopeRF is a manufacturer of a very interesting family of ISM band products, for 300 ~ 950MHz band and 2.4GHz band.
The products are available as module and as IC's. Cost and size are unique selling points.
The family of RFM22-modules are able to deliver an output power of +20dBm. Beside the RF products HopeRF has a familie in Pressure-Sensors, GPS-receivers and RF transistors.