Claris's improvisation on Chopin's Prelude
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Pro Comes bundled with Winamp
MilkDrop 2 comes as part of Winamp since version 5.5. It's also still available as a separate package if you wish to use it with other software.
Pro A huge preset pack is available
A preset pack with 760 visuals made by Tryptonaut is available. You can find it here
Pro Runs smooth on most modern computers
Plenty of user options to tweak for your system.
Con No user-friendly way of customizing the visualizations
Short of learning to code there are no ways to change how the presets behave.