| Relational databases | 24 | TiDB, Turso Database, Dolt |
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| Data integration | 23 | Canal, Airbyte, DataX |
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| Event streaming | 15 | Apache Kafka, NSQ, Apache RocketMQ |
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| Search engines | 15 | Elasticsearch, Meilisearch, Typesense |
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| Analytical databases | 13 | ClickHouse, DuckDB, Presto |
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| Graph databases | 13 | Dgraph, Neo4j, NebulaGraph |
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| Business intelligence | 12 | Apache Superset, Metabase, Redash |
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| Vector databases | 11 | Milvus, Qdrant, Chroma |
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| Document databases | 10 | SurrealDB, MongoDB, RethinkDB |
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| Stream processing | 10 | Apache Flink, RisingWave, Apache Storm |
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| In-memory key-value stores | 9 | Redis, Dragonfly, Valkey |
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| Data catalogs | 8 | OpenMetadata, DataHub, Unity Catalog |
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| DataFrame libraries | 8 | pandas, Polars, Dask |
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| Distributed SQL databases | 7 | CockroachDB, Apache ShardingSphere, Citus |
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| Time-series databases | 7 | InfluxDB, TDengine, TimescaleDB |
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| Data notebooks | 6 | marimo, JupyterLab, JupyterHub |
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| Data transformation and semantic layers | 6 | Cube, dbt, SQLMesh |
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| Embedded key-value stores | 6 | RocksDB, Badger, bbolt |
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| Data quality | 5 | Great Expectations, Pandera, Deequ |
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| Lakehouse table formats | 5 | Apache Iceberg, Delta Lake, Lance |
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| Database proxies and connection poolers | 4 | ProxySQL, PgBouncer, Odyssey |
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| Distributed key-value stores | 4 | etcd, TiKV, FoundationDB |
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| Kafka web UIs | 4 | Kafdrop, Redpanda Console, AKHQ |
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| Wide-column databases | 4 | ScyllaDB, Apache Cassandra, Apache HBase |
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| Actor toolkits | 3 | Vert.x, Akka, Apache Pekko |
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| Data processing engines | 3 | Apache Spark, Apache Hadoop, Apache Beam |
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| Database backup | 3 | pgBackRest, WAL-G, Barman |
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| Geographic information systems | 3 | QGIS, GDAL, PostGIS |
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| No-code databases | 3 | NocoDB, Teable, Grist |
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| Real-time messaging servers | 3 | Centrifugo, Mercure, Sockudo |
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| Database high availability | 2 | Patroni, pg_auto_failover |
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