The versions that can be downloaded from both the Imperial Software Technology and Motifdeveloper.com web sites are later versions than those made available by O'Reilly themselves. In particular, Volume 6A from IST is for Motif 2.1, whereas from O'Reilly it is for Motif 1.2.

Antony Fountain and Jeremy Huxtable of IST have completely overhauled Volume 6A, Motif Programming Manual, for Motif 2.1. This online edition is the first publication of the Third Edition, dated December 2001, and is the authoritative 'how-to' work on Motif 2.1. A printed edition will be available from IST in due course.

Volume 6B, Motif Reference Manual is also available in updated form online. This is the Second Edition of 6B, dated February 2000, for Motif 2.1, as revised and updated by Antony Fountain. The online edition has been augmented with a number of patches and the sections on UIL have been re-instated since the last paper publication of the volume. Volume 6B is the standard reference work on Motif 2.1.

About Imperial Software Technology
Imperial Software Technology (IST) is the leader in innovative software engineering and leading edge technology products. IST's specialties include Internet infrastructure technologies and user interface solutions for a wide range of platforms from Linux and UNIX workstations to hand-held and wireless devices. X-Designer, IST's award-winning graphical user interface builder product, is the leading product in its class. IST's Visaj visual builder for Java is integrated and delivered with a number of third-party products. Founded in 1982, IST ranks major corporations in finance, technology, aerospace, telecommunications, defense and government in a prestigious customer and client list. The company is privately held and is based in Palo Alto, California, and Reading, United Kingdom.

About Motifdeveloper.com
Motifdeveloper.com is the completely updated Motif on the World Wide Web, MW3. This site provides Motif programmers with an invaluable resource to help them in creating professional user interfaces with Motif, the world's most popular graphical toolkit for the X Window System. The site includes many thousands of resources together with regular Hints and Tips for developers working with Motif and the X Window System