Image editing tools

Gradia is an image or screenshot editing application with many tools for Linux. Free and open source program

PhotoCollage is a tool for creating photo collages. Free and open source program

XL Converter is a simple program for converting modern image formats. Free and open source program

Rnote is a vector-based application for sketching, handwritten notes, and annotating documents and images. Free and open source

Kramo Sly is an application for easy image editing. A free and open source program

ASCII Draw is an editor for drawing symbols: diagrams, tables, flowcharts and more. A free and open source program

Halftone is a simple lossy image compression application using the dithering technique. A free and open source program

Ipe is a drawing editor for creating shapes in PDF format. Free and open source

Letterpress – converting images into an image consisting of ASCII characters. A free and open source program

Xpano is a photo stitching tool focused on simplicity and ease of use. A free and open source program