Gabriel Knight Collections

Gabriel Knight Mysteries: Limited Edition (1997)
A collection that came with Gabriel Knight 1 and 2, a special soundtrack, and comic for GK1, and the novelization of GK1. The music cd also had some preview material for GK3.

This edition shares the box format of the Collection Series that came out around the same time, but it is not part of that series.

Gabriel Knight Bundle
The original 3 Gabriel Knight games on GOG can be bought separately or together as a bundle at a discount. This was the first time that the series was released digitally.

Classic Sierra Bundle (2016)
Buy much of Sierra's classic catalogue on Steam. Which includes the three original Gabriel Knight games.