SQLite is described as 'Software library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine. SQLite the most widely deployed SQL database engine in the world. The source code for SQLite is in the public domain' and is a very popular relational database in the development category. There are more than 50 alternatives to SQLite for a variety of platforms, including Windows, Linux, Mac, Self-Hosted and Web-based apps. The best SQLite alternative is PostgreSQL, which is both free and Open Source. Other great apps like SQLite are MySQL Community Edition, MariaDB, MongoDB and Microsoft SQL Server.
ObjectBox DB is an easy & fast object-oriented mobile database for Android, Linux, soon iOS. It supports relations, JavaRx, Kotlin. It is 10X faster than SQLite. And POJOs are POJOs.
UnQLite is a in-process software library which implements a self-contained, serverless, zero-configuration, transactional NoSQL database engine. UnQLite is a document store database similar to MongoDB, Redis, CouchDB etc.
YDB is an open source Distributed SQL Database that combines high availability and scalability with strong consistency and ACID transactions.
Azure Cosmos DB is a NoSQL document database service designed from the ground up to natively support JSON and JavaScript directly inside the database engine. It’s the right solution for web and mobile applications when predictable throughput, low latency, and flexible query are...
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.
TimesTen is a memory-optimized, relational database management system with persistence and recoverability. Originally designed and implemented at Hewlett-Packard labs in Palo Alto, California, TimesTen was spun out into a separate startup in 1996 and acquired by Oracle...
An embedded database built on object storage. Unlike traditional LSM-tree storage engines, SlateDB writes data to object storage to provide bottomless storage capacity, high durability, and easy replication.
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.
FerretDB (formerly MangoDB) is an open-source proxy, which converts MongoDB wire protocol queries to SQL, and uses PostgreSQL as a database engine.
Couchbase is the NoSQL database market share leader, with production deployments at AOL, Deutsche Post, NTT Docomo, Salesforce.com, Turner Broadcasting Systems, Zynga and hundreds of other organizations worldwide.
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Quick, easy to use, no SQL :)