This site currently only contains MPEG-1 format animations. MPEG-1 files can be played on both MPEG-1 and MPEG-2 players, however, in my experience, MPEG-2 players do a better job of playing them than MPEG-1 players do (the UNIX mpeg2play program is an example).
A wealth of information and MPEG players, encoders, and related programs can be found at http://www.crs4.it/~luigi/MPEG/.
To make mpeg2play usable as an external viewer for WWW browsers, I wrote a simple little Tk/Tcl script that allows you to control the command line arguments via a graphical interface. You need Tk 3.3 or later and Tcl 7.0 or later. This has been tested with Tk 4.0 and Tcl 7.4, on an SGI Indy running IRIX 5.3. You should either install the script somewhere in your path as mpeg_play, or make your WWW browser launch it instead of mpeg_play to play mpegs (this involves something with your .mailcap file).