Ambulant Player is an Open Source player for SMIL 2.0 documents (The full licensing details can be found in the developer section of this help file). It is intended primarily for the research community, and not as a replacement for commercial SMIL players such as the RealPlayer or QuickTime: while the performance is at least on par with such players (in our not so humble opinion:-) the Ambulant Player does not provide support for the wide range of media encoding formats that such players support.
The Ambulant Player website, www.ambulantplayer.org, has background information on the player and its design, demo documents, links to information on the SMIL 2.0 standard and much more.
Ambulant Player comes with two example documents: the Welcome document that you can play throught the Help->Play Welcome document command and a sample audio-visual slideshow on New York, NYC-SMIL, that is located in the installation directory. More sample documents can be found on the Ambulant Player website.