Tiny Nick writes:
New Fork of Blender Rhubarb LipSync that is focused on 2D Characters. Use this addon to directly animate a time offset modifier, or animate a custom integer/float property on an Active Object or Active PoseBone.
Rhubarb Lip Sync is a command-line tool that automatically creates 2D mouth animation from voice recordings. You can use it for characters in computer games, in animated cartoons, or in any other project that requires animating mouths based on existing recordings.