Vibration Viewer
The vibration viewer is an app to visualize normal modes.
The normal modes can be selected from the central dropdown menu by their wavenumber. The buttons next to the dropdown menu allow to quickly skim through all the modes.
The three-dot menu provides additional options:
Animate allows to pause and resume the animation.
Arrows shows the direction and amplitude that each atom moves.
Goto max pauses the animation at the point of maximum displacement.