Aeternity is a decentralized network that went live in testnet in 2017. Oracle machine that collects data from other sources and uses it in the smart contract. Stateful programming is not supported. As much as possible, Aeternity wants to be developer friendly.
The Oracle machine is critical because it allows access to data stored outside of the block chain. Both proof of labor and proof of stake have been used by the network.
While the aeternity is still on testnet, it is first traded as an ERC-20 token on Ethereum. I can also store it in any wallet that supports ERC-20. The token sale has expanded from a small team to a massive undertaking.