Their game Quake was ported to Linux in 1996, once again by Dave D. Taylor working in his free time.[6][7] Later id products continued to be ported by David Kirsch and Timothee Besset, a practice that continued until the studio's acquisition by ZeniMax Media in 2009.[8] In 1991 DUX Software contracted Don Hopkins to port SimCity to Unix, which he later ported to Linux and eventually released as open source for the OLPC XO Laptop.[9] Other early commercial Linux games included Hopkins FBI, an adventure game released in 1998 by MP Entertainment,[10] and Inner Worlds in 1996, which was released for and developed on Linux.[11] In 1998, two programmers from Origin ported Ultima Online to Linux.[12] A website called The Linux Game Tome began to catalog games created for or ported to Linux in 1995.[13]