Apache Cassandra is a free and open-source, distributed, wide column store, NoSQL database management system designed to handle large amounts of data across many commodity servers, providing high availability with no single point of failure.

Appwrite is an open-source backend server software that simplifies the development of web and mobile applications. It provides ready-to-use features like user authentication, database management, and file storage, allowing developers to focus on building their app's front-end functionality.

AWS Amplify is a comprehensive development platform offered by Amazon Web Services (AWS) that simplifies building scalable and secure web and mobile applications. It provides a set of tools, services, and libraries that enable developers to quickly create and deploy full-stack applications with seamless integration to various AWS services.

It is a set of backend cloud computing services and application development platforms provided by Google. It hosts databases, services, authentication, and integration for a variety of applications, including Android, iOS, JavaScript, Node.js, Java, Unity, PHP, and C++.

GraphQL provides a comprehensive description of the data in your API, which gives clients the power to ask for exactly what they need and nothing more and make it easier to evolve APIs over time. It also enables powerful developer tools.

MariaDB is a community-developed, commercially supported fork of the MySQL relational database management system, intended to remain free and open-source software under the GNU General Public License.

MongoDB is a source cross-platform document-oriented NoSQL database program

MySQL is an open-source relational database management system widely used for storing and retrieving structured data efficiently.

Neon is Serverless Postgres built for the cloud. It separates compute and storage to offer modern developer features such as autoscaling, branching, bottomless storage, and more.