If you look at [1] you can see some derivations from Milkdrop/Project M.
There were a lot of other, good visual plugins and software. VJ software, specifically, but also Libvisual just abstracts input and output, therefore allowing you to use all of these (supported) visualization plugins on any supported media player. It isn't much developed anymore these days, but this is the correct way forward.
Looking at the actors in Livisual [3] G-Force is decent but also a couple may be missing from earlier Libvisual releases. You may also like Lemuria [4]. Winamp's AVS is also FOSS [5].
There were a lot of other, good visual plugins and software. VJ software, specifically, but also Libvisual just abstracts input and output, therefore allowing you to use all of these (supported) visualization plugins on any supported media player. It isn't much developed anymore these days, but this is the correct way forward.
Looking at the actors in Livisual [3] G-Force is decent but also a couple may be missing from earlier Libvisual releases. You may also like Lemuria [4]. Winamp's AVS is also FOSS [5].
[1] https://en.wikipedia.org/wiki/MilkDrop
[2] https://github.com/Libvisual/libvisual
[3] https://github.com/Libvisual/libvisual/tree/master/libvisual...
[4] https://github.com/dr-ni/lemuria-2.1.1
[5] https://en.wikipedia.org/wiki/Advanced_Visualization_Studio