Papagayo is a lip-syncing program designed to help you line up phonemes (mouth shapes) with the actual recorded sound of actors speaking. Papagayo makes it easy to lip sync animated characters by making the process very simple - just type in the words being spoken (or copy/paste them from the animation's script), then drag the words on top of the sound's waveform until they line up with the proper sounds.
I am using dark OS theme, which makes text in waveform view look white and unreadable:
This pull request makes all text black to ensure readability: