The Collaborative International Dictionary of English v.0.48:

Gest \Gest\, n. [OF. geste exploit. See Jest.]
   [1913 Webster]
   1. Something done or achieved; a deed or an action; an
      adventure. [Obs.] --Chaucer.
      [1913 Webster]

   2. An action represented in sports, plays, or on the stage;
      show; ceremony. [Obs.] --Mede.
      [1913 Webster]

   3. A tale of achievements or adventures; a stock story.
      [Obs.] --Chaucer. Spenser.
      [1913 Webster]

   4. Gesture; bearing; deportment. [Archaic]
      [1913 Webster]

            Through his heroic grace and honorable gest.
                                                  --Spenser.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Gest \Gest\, n. [Cf. Gist a resting place.]
   [1913 Webster]
   1. A stage in traveling; a stop for rest or lodging in a
      journey or progress; a rest. [Obs.] --Kersey.
      [1913 Webster]

   2. A roll recting the several stages arranged for a royal
      progress. Many of them are extant in the herald's office.
      [Obs.] --Hanmer.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Gest \Gest\, n.
   A guest. [Obs.] --Chaucer.
   [1913 Webster]

The Free On-line Dictionary of Computing (19 January 2023):

Generic Expert System Tool
GEST

    (GEST) An expert system shell for
   Symbolics Lisp machine, with frames, forward chaining,
   backward chaining and fuzzy logic; written by John
   Gilmore(?) at GA Tech.

   (ftp://ftp.gatech.edu/pub/ai/gest.tar.Z).

   (1995-04-16)