Tumblr gallery of colorful or unique hair styles.
http://fuckyeah-hair.tumblr.com
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Library of information mostly related to 3D artist in game industry.
http://wiki.polycount.com
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Random human pose photo generator for life drawing simulation. Can set gender, coverage, and time.
http://artists.pixelovely.com/practice-tools/figure-drawing
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Historically accurate costumes.
http://historicalstock.deviantart.com/gallery
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Human proportion calculator.
http://hpc.anatomy4sculptors.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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Blueprtints of aircrafts for "anatomy" study of aircraft.
http://aviationshoppe.com
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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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Video references of fighting, facial expression, men, women, children, animal moving, etc...
http://www.referencereference.com
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The free tutorial videos section of Eat 3D website.
http://eat3d.com/free
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