DigitalNote (XDN) cryptocurrency is currently listed on the number of exchanges against cryptos (BTC or ETH). It emerged in 2015 as a Fair Launch, which did not imply any reward for developers, ICO campaign or premined blocks . Recently, XDN held a swap to the XDN 2.0 network with improved functionality.
SmartMesh (SMT) ERC-20 token is used as a means of payment within the SmartMesh ecosystem, as well as the reward coin to node contributors and users. It is listed on a few exchanges and trading against BTC, ETH and USDT.
Scry.info (DDD) is an Ethereum-based token of the Scry.info global data aggregator. DDD token is listed on a few exchanges paired against bitcoin and Ethereum. In this abbreviation, “DDD” stands for "distributed data depositary".