Pixelitor is a free and open source image editing software that supports layers, image effects; multiple undo, etc. It requires Java 8.It supports image filters, drawing, layers, multiple undo, etc. Currently, its main strength lies in the more than 70 image filters and color adjustments, some of which are unique.Pixelitor makes no claims to be the prettiest program out there but rather more about function. In other words, it is designed for more experienced users.