Top Alternatives to Microsoft SQL Server

MySQL Community Edition is the freely downloadable version of the world's most popular open source database.

SQLite is an in-process library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine.

he DBeaver is an SQL client and a database administration tool. For relational databases it uses JDBC API to interact with databases via a JDBC driver.

MongoDB is a free and open-source cross-platform document-oriented database program.

MariaDB is a community-developed fork of the MySQL relational database management system intended to remain free under the GNU GPL.

Apache CouchDB is open source database software.

Oracle Database (Oracle RDBMS or simply as Oracle) is an object-relational database management system.

RethinkDB is a free and open-source, NoSQL, distributed document-oriented database.

Couchbase is an open-source multi-model NoSQL document-oriented database software package that is optimized for interactive applications.

Apache Cassandra is a free and open-source distributed NoSQL database management system.

H2 Database Engine is a relational database management system written in Java.

Database .NET is a multiple database management tool.

Firebird is a relational database offering many ANSI SQL standard features.