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".
Tezos is a smart contract platform with its own blockchain and a native token (Tezos, XTZ). The governance is performed via Proof-of-Stake algorithm. It means that stakeholders (those who own at least 10,000 XTZ) vote for changes in the protocol. These validators ("bakers") get rewards for the performance of validation. The rewards are generated via inflation. Those who delegate their XTZ to bakers can earn, too.
Tezos has a built-in "self-amendment" mechanism which makes it possible to shape the network without having to make forks. It keeps the community united and makes development process easier.
Crypterium (CRPT) is a popular token available on major exchanges and through Crypterium app. It is the principal token of the Crypterium platform. You can buy these tokens with fiat (hard) currency, BTC, ETH and a number of other methods.
In 2019 summer, CRPT swapped to the Binance Chain.