Even though he was mainly famous for his Rock'nRoll Chuck Berry had the blues:
Lightning Hopkins was sick too:
Contemporary artist Otis Taylor does a good job:
Some folk artists had good blues songs too:
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Also something that you need to look into is the whole Mali / Niger / Desert Blues.
Vieux Farka Toure, son of the famous blues artist Ali Farka Toure:
This live performance is simply the best thing when it comes to guitar playing:
Bombino is very sick too:
This vietnam vet did some weird bluesy stuff too:
One man blues bands:
12 string blues:
Liver failure blues:
Guitar nerd blues, best blues:
Blues from across the pond:
Breaking bad twelve string blues:
(Note: Some of these songs might not sound bluesy at all, but it's hard to define the blues within borders)