Audiere is a portable audio library which supports playing MP3, Ogg Vorbis, FLAC, WAV, IT, XM, S3M, and MOD files. You can use it from C, C++, Python, Java, Delphi, and any language that supports XPCOM (JavaScript in Mozilla, for example).
Naikai is a set of game-oriented XPCOM components that vastly simplify the process of creating games. You can use Python or JavaScript or any XPCOM-enabled language to glue all of the provided components (image loaders, graphics renderers, a sound system
NPAPI XPCOM browser plugin for 3D engine (OpenSceneGraph, Ogre3D), providing simple Scene/Object/Viewport/Camera/Lighting interface to JavaScript in XUL applications or webpages.