We use a PBR workflow to create textures in GIMP and get them into Unreal Engine 4.
Reference Links:
http://texturelib.com/texture/?path=/...
http://texturelib.com/
https://forums.unrealengine.com/showt...
http://www.marmoset.co/toolbag/learn/...
https://seblagarde.wordpress.com/2014...
GIMP Normalmap Plugin:
http://registry.gimp.org/node/69
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https://www.patreon.com/PaulSwartz?ty=h
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Website:
http://www.cryonetic.com/