Joel Rosenberg’s stories of a D&D game that gets entirely too real.

The Sleeping Dragon
Novel published 1983.
The Sword and the Chain
Novel published 1984.
The Silver Crown
Novel published 1985.
The Heir Apparent
Novel published 1987.
The Warrior Lives
Novel published 1988.
The Road to Ehvenor
Novel published 1991.
The Road Home
Novel published 1995.
Not Exactly the Three Musketeers
Novel published 1999.
The characters of Kethol, Durine and Pirojil appearing in this story are analogues of the characters of the same names appearing in Rosenberg’s contribution to the Riftwar series.
Not Quite Scaramouche
Novel published 2001.
 
Not Really the Prisoner of Zenda
Novel published 2003.

Keepers of the Hidden Ways

Another series by Rosenberg that appears to be connected to the Guardians of the Flame series (two characters, one in each series, are cousins).

The Fire Duke
Novel published 1995.
The Silver Stone
Novel published 1996.
The Crimson Sky
Novel published 1998.