Looks like Linux was used to create Gollum :D

[leech]

Cool, look here and you can see that WETA must use KDE. In the lower left hand corner that definitely looks to me like that K. Not sure what software they're using there though. But that's Gollum. This snapshot is from the Two Towers Extended Edition, the Taming of Smeagol.

Leech

[Rakido]

yup

http://www.pcmag.com/article2/0,4149,1046864,00.asp

"Prior to starting production on The Lord of the Rings trilogy, we had foreseen the need for a lot of computing power," says Milton Ngan, digital operations manager at New Zealand–based Weta Digital, the studio behind the movies' stunning effects. But the company was on a fairly limited budget. "Linux opened up the possibility of running our software on a lower-cost platform. Furthermore, the major software applications used in our pipeline were also being ported to Linux."