Ultima I
Ultima II
Ultima III
Ultima IV
Ultima V
Ultima VI
Ultima VII
Ultima VII - Part 2
Ultima VIII
Ultima IX
Ultima Underworld I
Ultima Underworld II
Worlds of Ultima I
Worlds of Ultima II
Runes of Virtue I
Runes of Virtue II
Ultima Online
Miscellaneous - The Genesis of Ultima

Other compilations

Ultima Collection The Complete Ultima VII
Ultima Trilogy Ultima IX + Ultima Online
The Second Trilogy Underworld Series
Ultima I-VI Series  
Year of Release: 1998
Publisher: Locus
Contents: Book, 1x CD
An odd product, as it is basically a fan book about the series containing hints and solutions plus additional CD. It was created by Japanese publisher Locus who already made a couple of cluebooks for Origin before so it should be a legal distribution. The CD contains diskimages of Ultima I-IV and Akalabeth for the Apple II and the necessary emulation software (shareware) to play them.