H2 Database Engine is described as 'H2 is a relational database management system written in Java. It can be embedded in Java applications or run in the client-server mode. The disk footprint (size of the jar file) is about 1 MB' and is a Relational Database in the Development category. There are more than 50 alternatives to H2 Database Engine for a variety of platforms, including Windows, Linux, Mac, Online / Web-based and BSD. The best alternative is PostgreSQL, which is both free and Open Source. Other great apps like H2 Database Engine are SQLite (Free, Open Source), MongoDB (Freemium), MySQL Community Edition (Free, Open Source) and MariaDB (Free, Open Source).
PostgreSQL is a powerful, open source object-relational database system. It has more than 15 years of active development and a proven architecture that has earned it a strong reputation for reliability, data integrity, and correctness.
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.
MongoDB is a document database with the scalability and flexibility that you want with the querying and indexing that you need MongoDB stores data in flexible, JSON-like documents, meaning fields can vary from document to document and data structure can be changed over...
MariaDB is a backward compatible, drop-in replacement of the MySQL® Database Server. It includes all major open source storage engines. The source code for MariaDB is publically available from Launchpad. Binaries and packages are also available.
Base is a full-featured desktop database front end, designed to meet the needs of a broad array of users, for all kinds of usages, such as keeping track of collections of objects,maintaining customer information databases,maintaining student grade and curriculum...
SQL Server delivers on Microsoft’s Data Platform vision by helping your organization manage your data by enabling you to store data from structured, semi-structured, and unstructured documents within the database.
FileMaker is a cross-platform relational database application. It integrates a database engine with a graphical user interface and security features, allowing users to modify the database by dragging new elements into layouts, screens, or forms.
Apache CouchDB is a distributed, fault-tolerant and schema-free document-oriented database accessible via a RESTful HTTP / JSON API. It includes incremental map / reduce mechanics for queries and keeps data safe with an append-only datastore.
RethinkDB pushes JSON to your apps in realtime. When your app polls for data, it becomes slow, unscalable, and cumbersome to maintain. RethinkDB is the open-source, scalable database that makes building realtime apps dramatically easier.