Apart from Agility replacing Dexterity, this is the same attribute set previously used by The Star Wars Roleplaying Game.

This new scaling system is also present in D6 Fantasy and D6 Adventure, though the benchmark names for the values listed differ between the three games.

Eric J. Gibson reworked the D6 System into a more generic rules system, as the third iteration of West End Games published a series of three core hardcover books, D6 Adventure (2004), D6 Fantasy (2004) and D6 Space (2004), and supplements to these genre books focusing on creatures and locations were published in 2004 and 2005.

This was greatly expanded and revised by author Nikola Vrtis into the current D6 Space Rulebook (ISBN 978-1-932867-01-5), released in 2004 by Purgatory Publishing imprint West End Games.

Fires of Amatsumara is a setting book, mixing elements of space opera and frontier westerns, comparable to Firefly.