Outputs a GIF file from an Image or ImageProducer. NOTE: This may have patent issues. [Open Source]

Write java.awt.image.Image to a GIF. [Open Sounce, Non-commercial]

Sun's library that reads GIF, JPEG, TIFF, PNG, PICT, Photoshop, BMP, Targa, ICO, CUR, Sunraster, XBM, XPM, and PCX. [Sun Binary Code License]

Read and write GIF, JPEG, and ASCII. Read BMP, DICOM, and FITS. [Open Source, Public Domain]

Reads, writes, watermarks, transforms and comments animated and non-animated GIF images. Includes a fast and qualitative Java color quantizer. Supports text rendering, morphing filters, and ImageIO. [Commercial, with trial version]

Image editor written in Java that supports TIFF, GIF, JPG, BMP and PNG. [Commercial, with demo version]

An ImageIO library for reading microsoft .ico files. [Open source, LGPL]

A Java library for reading image files, thumbnails and metadata. It includes a utility to drop metadata from JPEG files. Can read predefined area of image, can read image channel and scale images. [Free for non-commercial use]

An image processing toolkit supporting tiling, deferred execution, and network imaging. [Sun Binary Code License]

Write JPEG files. [Open Source, no modification]