"He wrote a strategy game, Battle for Wesnoth."
The web site (www.wesnoth.org) states (currently at front page):
"Twelve years ago, David White sat down over a weekend and created the small pet project that we know today as The Battle For Wesnoth. At the time, Dave was the game’s sole programmer, working alongside another person, Francisco Muñoz, who produced the first graphics. As more and more people began to contribute in the years that followed, the game grew from a tiny personal project into the extensive one we know today."
The "Credits" page lists ESR as a significant contributor:
* Eric S. Raymond (ESR) - Macro library reorganization, major UI makeover introducing lightweight transparent popups and linger mode, maintainance tools for WML, eight campaigns lifted from UMC, one all-original campaign, editor refactoring, many many code cleanups, and svn-to-git migration.
But that does not really justify claiming he wrote the game.
I don't deny ESR is a programmer, and a good one, but his celebrity rests really on his writings and open-source advocacy, not his software.