Box cover of the collector's edition.
The Ultimate Doom Trilogy: Collector's Edition (also known simply as Doom Collector's Edition) is a commercially-sold compilation initially released on September 26, 2001.
It includes the following three games:
The games come with the Doom95 executable. The original DOS executables are not included in the compilation, however.
The compilation was re-released on January 29, 2003. The re-release includes a trailer, screenshots, and other information regarding Doom 3 (which was later released on August 3, 2004).