MariaDB is a backward compatible, drop-in replacement of the MySQL® Database Server. It includes all major open source storage engines.



The best alternative to Microsoft SQL Server is MariaDB, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Microsoft SQL Server and six of them are so hopefully you can find a suitable replacement. Other interesting alternatives to Microsoft SQL Server are SAP HANA, dotConnect for MySQL, SAP MaxDB and Starcounter.
MariaDB is a backward compatible, drop-in replacement of the MySQL® Database Server. It includes all major open source storage engines.



SAP HANA is a completely re-imagined platform for real-time business.
It transforms business by streamlining transactions, analytics, planning, predictive, sentiment data processing on a single in-memory database so business can operate in real-time.
dotConnect for MySQL is a high-performance ADO.NET data provider that grants simple access to MySQL and MariaDB databases when developing MySQL-based applications.

The Starcounter database is built with the real-time systems of today in mind. Real-time systems supporting thousands or millions of simultaneous users. Systems like online stores, location-based services or banking applications.
UnQLite is a in-process software library which implements a self-contained, serverless, zero-configuration, transactional NoSQL database engine. UnQLite is a document store database similar to MongoDB, Redis, CouchDB etc.