This cool cross-platform MIDI FX offers the best application of Euclidean beats to melodic, tonal material I've yet found, because it has two arpeggiate modes, which loop whatever notes you hold through however many tracks you've got set to arpeggiate. Other tracks can be set to any specific note, or to play a held chord, or to send MIDI CC. I just posted a video demo of all this in the topic here: https://www.kvraudio.com/forum/viewtopic.php?f=6&t=517113&p=7474380#p7474380
Apart from this killer feature, the plugin is about as rudimentary as it could be: No presets or saving, no rotating of tracks to offset the pulses relative to other tracks (only reason I docked it a star—REALLY hope they add rotating!), but in exchange it's super simple and elegant, and dirt cheap! I've got a lot of other ways to implement Euclidean beats, but this is so far my favorite because of that brilliant arpeggiate feature, which of course is just as cool on drum kits. It makes interacting with the beat totally fun and powerful.