ICOReader for the ImageIO API
- An ImageIO library for reading microsoft .ico files. [Open source, LGPL]
- http://www.vdburgh.net/2/f/files/ICOReader/

Read BMP Sample
- A BMP reader and sample application. [Open Source]
- http://www.lordjoe.com/JavaCourse/BMPLoader.html

Gif4J
- 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, w/ trial version]
- http://www.gif4j.com/

ImageroReader
- 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]
- http://reader.imagero.com/

PngEncoder
- A fast Java based PNG encoder. The footprint is just over 5K and the internal object creation during runtime is kept to a minimum to avoid calls to the garbage collector. It is compatible with JDK 1.1 and later.
- http://objectplanet.com/PngEncoder/

RasterMaster
- Class library, components, and applets offering display, printing and saving of TIFF, GIF, PNG, BMP, JPEG, MO:DCA IOCA and PTOCA, CMYK, CALS, DICOM, and JEDMICS. [Commercial, /w evaluation version]
- http://www.snowbound.com/Products/rmjava_eval.htm

LizardWorks TIFF library
- Read and write TIFF (Tagged Image File Format) files with application and applet examples. [Open Source, LGPL]
- http://www.lizardworks.com/libs.html

Sixlegs PNG library
- Load images in Portable Network Graphic (PNG) format. [Open Source, LGPL]
- http://www.sixlegs.com/software/png/

Tiffy
- Image editor written in Java that supports TIFF, GIF, JPG, BMP and PNG. [Commercial, w/ demo version]
- http://www.tiffy.de/

Java Advanced Imaging API
- An image processing toolkit supporting tiling, deferred execution, and network imaging. [Sun Binary Code License]
- http://java.sun.com/products/java-media/jai/

JPEG Encoder
- Write JPEG files. [Open Source, no modification]
- http://www.obrador.com/essentialjpeg/jpeg.htm

ImageJ
- Read and write GIF, JPEG, and ASCII. Read BMP, DICOM, and FITS. [Open Source, Public Domain]
- http://rsb.info.nih.gov/ij/

Acme.JPM.Encoders.GifEncoder
- Outputs a GIF file from an Image or ImageProducer. NOTE: This may have patent issues. [Open Source]
- http://www.acme.com/java/software/Acme.JPM.Encoders.GifEncoder.html

JIMI
- Sun's library that reads GIF, JPEG, TIFF, PNG, PICT, Photoshop, BMP, Targa, ICO, CUR, Sunraster, XBM, XPM, and PCX. [Sun Binary Code License]
- http://java.sun.com/products/jimi/

GIFOutputStream.java
- Write java.awt.image.Image to a GIF. [Open Sounce, Non-commercial]
- http://www.shetline.com/java.shtml

PNG Encoder
- Takes a Java Image as its input and produces a byte array in PNG format. [Open Source, LGPL]
- http://catcode.com/pngencoder/