Oracle Database is described as 'Delivers industry leading performance, scalability, security and reliability on a choice of clustered or single-servers running Windows, Linux, and UNIX. It provides comprehensive features to easily manage the most demanding transaction processing, business' and is a relational database in the development category. There are more than 50 alternatives to Oracle Database for a variety of platforms, including Windows, Linux, Mac, Web-based and Self-Hosted apps. The best Oracle Database alternative is SQLite, which is both free and Open Source. Other great apps like Oracle Database are PostgreSQL, MySQL Community Edition, MongoDB and Microsoft SQL Server.
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.
PostgreSQL is a powerful, open source object-relational database system with over 35 years of active development that has earned it a strong reputation for reliability, feature robustness, and performance.
MySQL Community Edition is a freely downloadable version of the world's most popular open source database that is supported by an active community of open source developers and enthusiasts.
MongoDB is a document database with the scalability and flexibility that you want with the querying and indexing that you need
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.
Tibero is an Oracle compatible SQL RDBMS that is secure, scales easily and conforms to today’s cost optimized cloud architectures.
Sequel Pro is a fast, easy-to-use Mac database management application for working with MySQL databases.
Open, free, and portable cloud. Elastic compute, block storage (non replicated), and virtual networking services in public alpha.
The Apache Cassandra database is the right choice when you need scalability and high availability without compromising performance.
A full-stack, syncing database that runs on both server and client. Pluggable storage (indexeddb, sqlite, durable objects), syncs over websockets, and works with your favorite framework (React, Solid, Vue, Svelte).
Filesystem-backed document DBMS in Rust where every record is a Git-versionable JSON file with automatic cryptographic integrity for compliance-critical systems.
FerretDB (formerly MangoDB) is an open-source proxy, which converts MongoDB wire protocol queries to SQL, and uses PostgreSQL as a database engine.
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First of all its most comparable to Oracle compared to the other solutions in this list. You are not limited to JSON, don't neet to jump to NoSQL. This doesn't mean that PostgreSQL is a FOSS alternative to Oracle. Programming in the database is quite different.