Cartesi $CTSI is an application-specific rollup execution layer with a Linux runtime.
Cartesi Rollups can be deployed as a layer 2 (on top of Ethereum), as a layer 3 (on top of Optimism $OP , Arbitrum $ARB , zkEVM chains, etc.), or as sovereign rollups. It opens up the design space for more expressive and computationally intensive blockchain applications.