MonkeyJam is described as 'digital penciltest program. It is designed to let you capture images from a webcam, camcorder, or scanner and assemble them as separate frames of an animation'. There are more than 10 alternatives to MonkeyJam for a variety of platforms, including Windows, Mac, Linux, Android and iPhone. The best alternative is OpenToonz, which is both free and Open Source. Other great apps like MonkeyJam are Synfig Studio (Free, Open Source), Pencil2D (Free, Open Source), Adobe Animate (Paid) and Animation Desk (Freemium).