Free texture sites

I thought it might be an idea to have a thread where we can post some good free texture sites or even paid for. As we know it can be a pain trawling through Google for just the right texture CC0 are pretty good and can be found here [You must be registered and logged in to see this link.] as are Skeetchup texture club which can be found here [You must be registered and logged in to see this link.]