http://www.blizzard.com
2. Id Software
http://www.idsoftware.com
3. Westwood Studios
http://www.westwood.com
4. Kalisto
http://www.kalisto.com
5. Midway
http://www.midway.com
6. SingleTrac
http://www.singletrac.com
7. Valve Software
http://www.valvesoftware.com
8. Squaresoft
http://www.squaresoft.com
9. Neversoft Entertainment
http://www.neversoft.com
10. Shiny Entertainment
http://www.shiny.com