H2 Database Engine Alternatives

MongoDB (from "humongous") is a scalable, high-performance, open source NoSQL database.

open-source

Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.

4D is a relational database management system and IDE.

It is Both Under the GPL and it is also Proprietary if using the GPL version the software you make...

ESM Tools is a powerful and widely known software development platform that comes with a centralized model infrastructure, providing the common frame for compiling, running, downloading, and organizing models (ones or multiple).

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IBM Informix is a secure embeddable database optimized for OLTP and IoT data. Informix can seamlessly integrate SQL, NoSQL/JSON, and time series and spatial data.

The Apache HDFS is a distributed file system that makes it possible to scale a single Apache Hadoop cluster to hundreds (and even thousands) of nodes.

SQLite Home Page

The world's most trusted and proven in-memory database management system with hybrid architecture and outstanding support for over 19 years.

The Apache Cassandra database is the right choice when you need scalability and high availability without compromising performance.

Document-Oriented NoSQL Database

Online Database Software. TeamDesk is a web-based database aimed to facilitate working with data, organize and store information you are using in your routine work, create an easily accessible data source for your team.

paid Free Trial $49.0 / Monthly (5 Users, Unlimited tables, records, storage space and support)