Color the notes of each voice
This plugin colors the notes (and as of 2.x versions also rests, stems, hooks, beams, dots, accidentals and stem-slashes) according to their voice. The color scheme is the same as the toolbar:
Voice 1 - Blue, Voice 2 - Green, Voice 3 - Yellow, Voice 4 - Purple
You can change the colors back to black by either just running it again (on the same selection) or using @lasconic's Remove Notes Color plugin.
This plugin has a versions for MuseScore 1.x, 2.x, 3.x and 4.x!
API compatibility
1.x
2.x
3.x
4.x
Plugin categories
Analysis
Notes & Rests
Proof reading