| MySQL | 20,287 | https://mysql.com |
| PostgreSQL | 1,727 | https://www.postgresql.org/ |
| MariaDB | 1,383 | https://mariadb.org |
| Redis | 798 | https://redis.io |
| Firebase | 509 | https://firebase.google.com |
| MongoDB | 20 | https://www.mongodb.org |
| Lucene | 10 | https://lucene.apache.org/core/ |
| Solr | 10 | https://lucene.apache.org/solr/ |
| Virtuoso | 5 | https://virtuoso.openlinksw.com/ |
| SQLite | 1 | https://www.sqlite.org |