17. ZK Modularization Celestia @celestia: A modular data availability layer used by many Rollup projects, including ZK Rollup, for scalable data publishing. EigenDA @eigenlayer: A data availability service built on EigenCloud for use by ZK Rollup teams. Avail @AvailProject: A standalone data availability chain for use by ZK Rollup. EthStorage @EthStorage: L2 storage for hosting Rollup data and proofs. AltLayer @alt_layer: A Rollup-as-a-Service platform. Caldera @Calderaxyz: A Rollup infrastructure provider that supports launching custom Rollups using ZK or optimistic proof systems. Zeeve @0xZeeve: An enterprise-grade blockchain infrastructure platform that hosts and manages ZK Rollup deployments. Gateway FM @gateway_eth: A Rollup infrastructure service for launching application-specific Rollups (including ZK variants). Stackr @0xStackr: A micro-summarization framework, typically used in conjunction with zero-knowledge proofs, for building lightweight, application-specific chains. Nym @nym: Mixnet and a suite of credentials built for advanced privacy and zero-knowledge identity. Origin @origin_trail: A knowledge graph for verifying data sources and AI-ready knowledge assets, providing input for zero-knowledge circuits or zero-knowledge models (ZKML).