Super-Rogue was developed from Rogue 3.6 by Robert Kindelberger, who added many new monsters and items. The final version, numbered 9.0, was completed in 1984.
Some of Super-Rogue's features, such as shops, mazes, and cockatrices, appeared in the original Hack at about the same time.
The Roguelike Restoration Project updated Super-Rogue to run on modern systems.
The Roguelike Gallery modified Super-Rogue to work with rlgallery.org's system, and fixed a few bugs which made winning easy.
The source code is available for download. Warning: I haven't gotten to the documentation yet.