What program can I use to turn a human face into a devil or demon face in a video easily?
This definitely wasn't user-friendly or easy-to-use software, or at least not a one-click solution.
The third video you posted is "the original" and I know I've seen it before. Probably some viral marketing scheme. The second one is a "ripoff", if you can say that, and my best guess is that you can use After Effects for it, like this guy.