HES is also for Historical European Swordsmanship.

The Hypertext Editing System, or HES, was an early hypertext research project conducted at Brown University in 1967 by Andries van Dam, Ted Nelson, and several Brown graduate students. HES was a pioneering hypertext system that organized data into two main types: links and branching text. The branching text could automatically be arranged into menus and a point within a given area could also have an assigned name, called a label, and be accessed later by that name from the screen.

HES ran on an IBM System/360/50 mainframe computer, which was inefficient for the task of running such a revolutionary system. Although HES pioneered many modern hypertext concepts, its emphasis was on text formatting and printing. HES research was funded by IBM but the program was stopped around 1969 and the program was reportedly sold to NASA's Houston Manned Spacecraft Center, which reportedly used the program for documentation on the Apollo space program. HES was discontinued and replaced by the FRESS (File Retrieval and Editing System) project.