This is the Utah Raster Toolkit distribution version 3.0 of June, 1990.
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librle.a, image.rle file type support, animation, rletogif, converters, many utilities.
RLE format supports a great number of raw inner formats for applications to use, known together as .rle (ie, "stored windowing")
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The Utah Raster toolkit is a collection of programs and C routines for dealing with raster images commonly encountered in computer graphics. It provides the following major functions:
* A device and system independent image format for storing images and information about them. Called the RLE format, it uses run length encoding to reduce storage space for most images.
* A library of C routines for reading, writing and manipulating images stored in the RLE format.
* A collections of programs for manipulating and displaying RLE images.
License: says it's "GNU like" in the license.