Diego Antonio de Membiela Sánchez (drfrag)

Diego Antonio de Membiela Sánchez, commonly known as drfrag/drfrag666 within the Doom and ZDoom communities and dondiego elsewhere, is a Spanish programmer and modder. A prolific programmer, Sánchez's work is mostly focused on source ports and derivatives of the ZDoom codebase.

Contributions
In regards to Doom history, Sánchez has created numerous source ports:

Source ports

 * csZDoom
 * GZDoom Vintage
 * LZDoom
 * RUDE
 * ZDoom32
 * ZDoom CL
 * ZDoom LE
 * ZZDoom
 * GZDoom32 (Discontinued)
 * GLZDoom32 (Discontinued)

Other developments
Outside of his ports, Sánchez has worked on the following:
 * Romero's Heresy - An unofficial patch for Heretic: Shadow of the Serpent Riders 1.3. It ports the Heretic levels to Doom II, so they can be played with Doom monsters and weapons. It is a tribute to John Romero.
 * Romero's Heresy II - A universal ZDoom replacer mod for Heretic: Shadow of the Serpent Riders to play all Heretic levels with Doom and Heretic weapons and monsters. All Heretic monsters have been modified. Another tribute to John Romero.