I think this quote from smooth summarizes SDC rather effectively.
There are no other cryptonote-based coins in the top 100 on coinmarketcap besides XMR and BCN.
SDC uses a cryptonote-based design for their anonymous tokens, which is a bit different in terms of coin design and doesn't share code but the cryptography is almost identical.
They call it "zero knowledge solution" though.
Perhaps that is self descriptive.
I didn't see "XMR" or "BCN" in the title of this thread. The shameless promotion "distills" the "essence" of your motives here.
Interesting bit of information I found in the comment section of the recent SDC article regarding Cryptonote, which is why I'm glad SDC doesn't share it's codebase.
https://en.wikipedia.org/wiki/CryptoNote#NSA_involvement"Darknote" is also a CN based coin in the top 100