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
Ultima Trilogy - IBM PC version
Others: Apple II C64 FM Towns

Other compilations

Ultima Collection Ultima IX + Ultima Online
Second Ultima Trilogy Underworld Series
Ultima I-VI Series Miscellaneous
The Complete Ultima VII  
Year of Release: 1989
Publisher: Origin Systems Inc.
Contents: Ultima Trilogy Manual, Reference Guide, Install Guide, 3 cardboard maps (18 x 12" / 45 x 30 cm), 3x 5.25" disk
The Ultima Trilogy was the first compilation of the Ultima Series from Origin. The package contained 3 folded cardboard maps and a single manual that covered all three games. It is the only compilation that was available for other systems beside the IBM PC compatibles.