The Bluetooth wireless technology is a worldwide specification for a small-form factor, low-cost radio solution that provides links between mobile computers, mobile phones, other portable handheld devices, and connectivity to the Internet. The specification is developed, published and promoted by the Bluetooth Special Interest Group (SIG).
BlueZ provides support for the core Bluetooth layers and protocols. It is flexible, efficient and uses a modular implementation. It has many interesting features:
http://jamesbond3142.no-ip.org/blog/?viewDetailed=00031
http://padovan.org/blog/2013/02/the-big-changes-of-bluez-5/
http://www.bluez.org/bluez-5-api-introduction-and-porting-guide/
https://code.google.com/p/bluez-tools/