Various open source database management programs, such as LibreOffice Base and Apache OpenOffice Base, are completely free. Many of the popular database engines and tools used by developers, such as Apache Cassandra and Memcached, are also free.
LibreOffice Base and Apache OpenOffice Base are desktop database front-ends that can manage database systems or stand alone. As of 2015, AlternativeTo.net ranks LibreOffice Base as the best alternative to Microsoft Office Access.
Developer-oriented database engines are often open source and free. Organizations that make the software usually make binary copies available to download, such as Firebird, which is available for download on SourceForge.net.