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About Opal

Opal is a full-featured library that supports a variety of protocols and multi-media fornats. Features include:

* Low latency RTP stack designed specifically for real-time multimedia
* Full featured H.323, SIP and IAX2 protocol stacks
* Audio codecs including G.711, GSM06.10, Speex and iLBC.
* Video codecs including H.261 and H.263
* Run-time loadable codec interface for proprietary or codecs such as G.729, H.263, H.264 and MPEG4
* Completely Open Source using the commercially friendly MPL 1.1 license

Through the use of a platform isolation library called PTLIB, Opal can run on tiny embedded systems or multi-processor servers.

Source:
http://www.opalvoip.org/

LightBlue is a cross-platform Bluetooth API for Python which provides simple access to Bluetooth operations. It is available for Mac OS X, GNU/Linux and Nokia’s Python for Series 60 platform for mobile phones.

LightBlue provides simple access to:

* Device and service discovery (with and without end-user GUIs)
* Standard socket interface for RFCOMM and L2CAP sockets (currently L2CAP client sockets only, and not on PyS60)
* Sending and receiving files over OBEX
* Advertising of RFCOMM and OBEX services
* Local device information

Source:
http://lightblue.sourceforge.net/