FOSStriangulator is described as 'A free and open-source tool for making triangulated illustrations out of photos. Simply open an image, generate points in-app automatically, adjust the generated points (click to add or use the eraser mode to remove), and export' and is an app in the Photos & Graphics category. There are five alternatives to FOSStriangulator for a variety of platforms, including Mac, Windows, iPhone, iPad and Android Tablet. The best alternative is Triangulator, which is free. Other great apps like FOSStriangulator are Image triangulator (Free), Dmesh (Freemium), Trigrad (Freemium) and Trimaginator (Paid).
Image Triangulator gives you the ability to triangulate any image. The level of abstraction you get depends on the amount of points you plot. The app will allow you to save your plotted points as a text file and the final image as a pdf.
DMesh, designed by Dofl Yun, is a custom creative application that turns images into techy artwork. It works by analyzing an image and generating a triangulation pattern for a beautiful finished product.