FerretDB is described as '(formerly MangoDB) is an open-source proxy, which converts MongoDB wire protocol queries to SQL, and uses PostgreSQL as a database engine' and is an app in the development category. There are more than 50 alternatives to FerretDB for a variety of platforms, including Linux, Windows, Mac, Web-based and Self-Hosted apps. The best FerretDB alternative is SQLite, which is both free and Open Source. Other great apps like FerretDB are PostgreSQL, MySQL Community Edition, MongoDB and MariaDB.
GraphDB is a RDF graph database or triplestore. It is the only triplestore that can perform semantic inferencing at scale allowing users to create new semantic facts from existing facts. It also has the ability to visualize triples.
The Document-Graph database supports SQL and Native Queries, asynchronous commands, intents, and much more.
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.
SQLGate is an integrated database management and development solution that simplifies the construction and operation of databases. A solution that fits different types of databases, SQLGate is customized for seven different databases that make up 83.2% of the DBMS market.
HSQLDB (Hyper Structured Query Language Database) is a relational database management system written in Java. It has a JDBC driver and supports a large subset of SQL-92 and SQL:2008 standards. It offers a fast, small (around 1300 kilobytes in version 2.
A NoSQL database running in a Lua application server. Tarantool combines the network programming power of Node.JS with data persitence capabilities of Redis.
CUBRID is a comprehensive GPL/BSD open source relational database management system highly optimized for Web Applications. CUBRID is being developed in C/C++. Includes native HA, online hot backup, and other features. JDBC, PHP, ODBC/.NET, Ruby & Python APIs.
HBase is an open source, non-relational, distributed database modeled after Google's BigTable and is written in Java. It is developed as part of Apache Software Foundation's Apache Hadoop project and runs on top of HDFS (Hadoop Distributed Filesystem), providing...
Vertica is a grid-based, column-oriented database designed to manage large, fast-growing volumes of data and provide very fast query performance when used for data warehouses and other query-intensive applications.
Hazelcast is an in-memory Open Source data grid based on Java. By having multiple nodes form a cluster, data is evenly distributed among the nodes. This allows for horizontal scalability both in terms of available storage space and processing power.
OrbitDB is a serverless, distributed, peer-to-peer database. OrbitDB uses IPFS as its data storage and IPFS Pubsub to automatically sync databases with peers. It's an eventually consistent database that uses CRDTs for conflict-free database merges making OrbitDB an excellent...
LiteDB is an open-source, MongoDB-like database that requires no configuration and is mobile-ready. It's a serverless database delivered in a single DLL under 450kb, fully written in .NET C# managed code and compatible with .NET 4.5 and NETStandard 2.0.
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