Apache Cassandra
Open source · Cloud / On-prem · Free trial
Apache Cassandra is the strongest choice for write-heavy, globally distributed workloads — linear scalability with no single point of failure — but operational complexity is significant without managed services like DataStax Astra.
Best for: Teams running write-heavy workloads at massive scale (millions of writes/second) that need multi-datacenter replication and zero-downtime availability.