Overview
The web is full of audiovisual, SVG, HTML5 and VRML content, but only a few sites propose BIFS content.
Apart from the demos hosted on this site and in GPAC’s test suite, you may find the following links useful.
MPEG4 Systems content
MPEG-4 Systems Conformance Streams
Telecom Paris is hosting a large repository of conformance streams for MPEG-4 Systems. These streams may proove extremely usefull but may as well be a complete waste of time, authoring simplicity being not required for MPEG-4 conformance tests!
Commercial and educational MPEG-4 Systems Content
Telecom Paris has a nice set of examples available, although some are rather old and were designed to be playable, coping with rendering bugs of players available at those prehistoric times.
MP4MENU
MP4MENU is a A rather complete mapping of DVD interactivity to the BIFS standard, under GPL license.
SVG Content (Full, Mobile, Basic, Tiny)
A lot of SVG content is available on the Internet. If you are an SVG beginner, you should start with the SVG 1.1 test suite.
Some very nice cliparts are also available on mozilla web site.
VRML and X3D content
A lot of VRML/X3D content is available on the Internet. If you are a VRML/X3D beginner, you should start with the Web3D X3D resource page.