The best Relational Database alternative to Microsoft SQL Server is SQLite, 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 many of them are Relational Databases so hopefully you can find a suitable replacement. Other interesting Relational Database alternatives to Microsoft SQL Server are PostgreSQL, MySQL Community Edition, MariaDB and MongoDB.
SQLite is a software library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine. SQLite is the most widely deployed SQL database engine in the world. The source code for SQLite is in the public domain.
PostgreSQL is a powerful, open source object-relational database system with over 35 years of active development that has earned it a strong reputation for reliability, feature robustness, and performance.
MySQL Community Edition is a freely downloadable version of the world's most popular open source database that is supported by an active community of open source developers and enthusiasts.
MariaDB is a backward compatible, drop-in replacement of the MySQL® Database Server. It includes all major open source storage engines.
MongoDB is a document database with the scalability and flexibility that you want with the querying and indexing that you need
DbGate is cross-platform database manager. Simple and effective, allowing to work with many various databases simultaneously - SQL and NoSQL.
Oracle Database delivers industry leading performance, scalability, security and reliability on a choice of clustered or single-servers running Windows, Linux, and UNIX. It provides comprehensive features to easily manage the most demanding transaction processing, business...
The Apache Cassandra database is the right choice when you need scalability and high availability without compromising performance.
Amazon Redshift uses SQL to analyze structured and semi-structured data across data warehouses, operational databases, and data lakes, using AWS-designed hardware and machine learning to deliver the best price performance at any scale.
DB2 offers industry leading performance, scale, and reliability on your choice of platform from Linux to z/OS. DB2 supports storing XML and relational data and offers SQL PL and PL/SQL procedural languages.
A complete cloud-first data platform that includes a multi-model transactional data management engine, an application development platform, and interoperability engine, and an open analytics platform.
Firebird is a relational database offering many ANSI SQL-92 features that runs on Linux, Windows, and a variety of Unix platforms. Firebird offers excellent concurrency, high performance, and powerful language support for stored procedures and triggers.
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Its free with same power of MS SQL