BLOCKv (VEE) is the utility Ethereum token of the BLOCKv platform, where users can develop virtual objects (vAtoms). You can trade VEE tokens with a number of exchanges. BLOCKv (VEE) token was launched in 2017.
Siacoin is a utility token of the cloud storage platform called the Sia network. Sia is open-source and blockchain-based. The operations take place on Sia's own blockchain. The coin is used to pay for storage rent transactions. The coin is Proof-of-Work-based meaning that Siacoin can be mined. Another use for the coin is trading.
Pura (PURA) digital assets seem to be currently inactive. Originally, the developers’ idea was to leverage anonymous and instant transaction through offering PURA coin. PURA is the project of the Dash team.