According to Celestia's official blog, Rollkit (formerly known as Rollmint), Celestia's modular Rollup framework product, has been operated independently and become a public project led by the community. Rollkit builds are currently available on Celestia's Mocha testnet. By using Rollkit's modular framework, developers can customize Rollup and plug in arbitrary data availability and execution layers. Rollkit provides a modular node for running Rollup on top of a data availability layer, Celestia said. At the same time it exposes an ABCI-compliant client interface that can be used as a replacement for Tendermint for ABCI-compliant blockchain applications.