Eventuate is a toolkit for building applications composed of event-driven and event-sourced services that collaborate by exchanging events over shared event logs. Services can either be co-located on a single node or distributed up to global scale. Services can also be replicated with causal consistency and remain available for writes during network partitions. Eventuate has a Java and Scala API, is written in Scala and built on top of Akka, a toolkit for building highly concurrent, distributed, and resilient message-driven applications on the JVM. Eventuate

• provides abstractions for building stateful event-sourced services, persistent and in-memory query databases and event processing pipelines
• provides services a reliable and partition-tolerant event bus with causal event ordering and distribution options up to global scale
• supports stateful service replication with causal consistency and concurrent state updates with automated and interactive conflict resolution
• provides implementations of operation-based CRDTs as specified in A comprehensive study of Convergent and Commutative Replicated Data Types
• supports the development of always-on applications by allowing services to be distributed across multiple availability zones (locations)
• supports the implementation of reliable business processes from event-driven and command-driven service interactions
• supports the aggregation of events from distributed services for updating query databases
• provides adapters to 3rd-party stream processing frameworks for analyzing event streams

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