Juggle Saver is a Windows screensaver that animates juggling patterns in 3D using OpenGL. The program is rather dated and doesn’t work on modern hardware with multiple monitors. Screensavers are no longer a big thing so the code is unlikely to be updated.
The update using Javascript and WebGL works on most modern browsers and is the best way to see the animation engine at work.

Download: JSInst.exe (98KB). Note: this screensaver only works on legacy Windows versions and does not work on Windows 11.
A port of JuggleSaver was included in the xcreensaver project and this code was in turn incorporated into JuggleMaster.
The source is available on github.