Apache Kafka vs FoundationDB

Apache Kafka is an open-source distributed event streaming platform used for building real-time data pipelines and streaming applications. Originally developed at LinkedIn, it provides high-throughput, fault-tolerant publish-subscribe messaging with persistent storage. Kafka supports stream processing through Kafka Streams and ksqlDB.

FoundationDB is a databases tool that distributed key-value store from apple providing acid transactions across a scalable, fault-tolerant cluster. It is open source software.