- imagemagick: Tools and libraries to manipulate images in many formats
- graphicsmagick: Image processing tools collection (iamgemagick fork)
- gd: Graphics library to dynamically manipulate images (lib)
- netpbm: Image manipulation (cli old)
- openexr: High dynamic-range image file format (lib for exposure)
- webkit2png: Create screenshots of webpages from the terminal
- gifsicle: GIF image/animation creator/editor
- giflib: Library and utilities for processing GIFs
- libtiff: TIFF library and utilities
- webp: Image format providing lossless and lossy compression for web images
- guetzli: Perceptual JPEG encoder
- jasper: Library for manipulating JPEG-2000 images
- jpeg: Image manipulation library
- jpeg-turbo: JPEG image codec that aids compression and decompression
- jpegoptim: Utility to optimize JPEG files
- openjpeg: Library for JPEG-2000 image manipulation
- pngquant: PNG image optimizing utilitypngquant
- optipng: PNG file optimizer
- libpng: Library for manipulating PNG images
- imagesnap: Tool to capture still images from an iSight or other video source