Nobbie.io is interesting because they are a marketplace/e-commerce dealing in DGC/BTC.
I have been following the digitalcoin com. for 1y&half and their orginal goal has been to create a coin to transact with on the digital realm. Now, of course they are a scrypt fork with a hard coded limit for the supply so they cannot be ever a currency.
But they should be convertible to NuBits and their marketplace is interesting to learn from.
Edit: added direction to the site