A free program for Android, by Grey Desk Inc.

To change the speed of your videos, use the Slow Motion Video Editor. Slo-mo and time-lapse can both be used on the same video. How awesome is it that you can speed up sections of a video while slowing down others?

Video can be sped up or slowed down with NO WATERMARK and FREE SAVING! supports limitless video duration, adjusted audio pitch, and portrait or landscape operation.

Here are some of the perks that this app comes with: