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EQW
From Project 1999 Wiki
Originally (in the classic era) EverQuest could not be played in windowed mode; only full-screen. However, a third-party program called EQW allowed windowed play. EQW was technically banned but because it only ran on the client-side it (and another client-side third-party program, ShowEQ) were difficult to detect, and thus many players used it.
A newer version of this program known as EQW2, from a company called Lavishsoft, is still used by some Project 1999 players today to resolve specific game issues.