Wide-Column databases

Masterless wide-column database built for always-on writes across data centers.

C++ rewrite of Cassandra with shard-per-core design; also speaks the DynamoDB API.

Google's managed wide-column store, the original Bigtable, with HBase API and SQL access.

Hadoop's Bigtable clone: strongly consistent wide-column tables on top of HDFS.

Sorted, distributed key-value store on HDFS with cell-level security labels.

Serverless Cassandra-as-a-service with vector search and a JSON Data API, now owned by IBM.

Serverless, CQL-compatible Cassandra service on AWS with no clusters to manage.

Microsoft's globally distributed, multi-API NoSQL and vector database with SLA-backed latency.

Apache-licensed distributed SQL that reuses the PostgreSQL query layer on a Raft-replicated storage engine.

Cheap, schemaless key-attribute store inside an Azure Storage account.

Oracle's sharded key-value and JSON store, available as Apache-licensed software or an OCI service.

Young C storage-engine library: transactional LSM with MVCC, column families and TTL.

Converged C/C++ NoSQL platform mixing key-value, documents, time-series, stream processing, graph and ML.

Tencent's financial-grade MySQL-compatible database family: distributed TDSQL and cloud-native TDSQL-C.