Should still be free, albeit limited download size per 24 hr. Lots of clean and even pre-tiled textures.
http://cgtextures.com
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A very large photo library of wild life in the UK, or by UK photographers. Most, if not all, of which are properly named in either common name or scientific name.
http://www.wildaboutbritain.co.uk/pictures
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Interesting color related tool. One tool lets you choose up to 5 colors, and the collage wall on the left will auto select photos from Flikr that fit your color theme. Another tool lets you upload an image and it will pick out a selective palette for you based on that image.
http://labs.tineye.com
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Mostly female pose reference. Lots of pose and view angle varieties, with many props but no costumes.
http://senshistock.deviantart.com/gallery
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Video references of fighting, facial expression, men, women, children, animal moving, etc...
http://www.referencereference.com
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Photo collection of hairstyles, grouped by length, gender, and special occasion.
http://www.hairfinder.com/hairstyles_pictures.htm
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Large photo collection of birds, along with other nature related themes.
http://mydigitalmind.deviantart.com/gallery
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Mostly female pose reference in fantasy-ish and steam punk costumes. Some nude or near-nude.
http://mjranum-stock.deviantart.com/gallery
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Organized reference of military aircraft, small arms, etc.
http://www.militaryfactory.com
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Scroll down to see pictorial manuals for various martial art on whole body pose, arm position, lower body stance, and finger forms.
http://www.pinterest.com/peachymini/anatomy-and-character-poses
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