A free program for Android, by CodeEdifice.

Have you ever wanted to make a video more dramatic or entertaining by speeding it up or slowing it down? With the help of the Fast & Slow Motion Video app, now you can! This app gives you the ability to easily change any video’s pace by turning it into a slow-motion or fast-motion version. In addition, you can trim your video and add your preferred music to it.

Simply choose your video from your camera or gallery, your preferred audio, and your preferred speed before clicking the “Done” button. After that, you can relax and wait for the app to finish its work. When it is finished, you can share your work with your family or friends.