A well known computational knowledge engine that has integrated Cardano blockchain data, enabling developers to use their API sources as oracles.
The WolframAlpha Language is an attempt to represent everything in the world in computational terms. Users of the WolframAlpha Language can interact with the Cardano blockchain and it can be used to both add data to the blockchain, e.g. to mint NFTs, and to pull data from the blockchain e.g. to query a transaction. This functionality works for both the Cardano Mainnet and the Cardano testnet.
Most significantly, smart contract developers are able to use the WolframAlpha APIs to inform their smart contracts with data from the world outside of the blockchain.