There are plenty of websites on the internet that offer free textures. However, browsing through 40-50 sites to find a certain texture can prove to be a time consuming task. With that in mind, I have made a selection of 10 websites which I thought may be useful to you too.

http://www.cgtextures.com/
Probably the most notorious site where you can find tons of free textures of various categories.

http://www.mayang.com/textures/
One of the oldest textures sites on the internet.

http://www.marvamarble.com/Product-Index.htm?u
A very comprehensive site where you can find tons of marble and stones textures.

http://vyonyx.com/category/down/cutout-people/
Probably the best site for free people cutouts; each file comes in psd format so you can easily composite it on your rendering.

http://downloadarea.margraf.it/
A great site for marble textures. Registration is required.

http://free-textures.got3d.com/natural/free-grunge-textures/index.html
Several categories, but I especially like the grunge textures.

http://www.michalkotek.com/download.html
A nice collection of textures and a set of trees cutouts.

http://www.defcon-x.de/c4d/textures
Several types of wood textures

http://free3dstextures.com/
Most of the textures available from this site require additional work in order to make them tileable, but the resolution and the sharpness are great.

http://texturez.com/
Another great site with large variety of textures.

Again, this isn’t meant to be the most comprehensive list, but if you think that I have missed something important, feel free to post a link in the comments section.