Cool fancy programs?

Hello,

I'm looking for as many cool, even if pointless, programs as I can, be them terminal programs or gui ones. What do I mean by this? I'll use some examples:

• The Cube (I believe it was called Compiz): the one we all know and love.
• cmatrix
• the hollywood one
• That one whose name I forget but basically spawns a cat that chases your cursor, I saw it showcased on Pop!_OS' mastodon.
• wobbly windows
• Burn my window
• tplay

if any of you know any other fancy program like this let me know please. I want to showcase them to non-linux people to show them what can be done here but not necessarily in other OSes (particularly Windows).