Ripio Credit Network (RCN) is the ERC20 utility token of the eponymous credit network. It is a cost-effective tool that allows to process a cost-free transaction within the ecosystem. The token is trading on the number of exchanges paired with other cryptos.
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.