There are many alternatives to Oracle Database for Windows if you are looking for a replacement. The best Windows alternative is SQLite, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Oracle Database and many of them are available for Windows so hopefully you can find a suitable replacement. Other interesting Windows alternatives to 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.
The Apache Cassandra database is the right choice when you need scalability and high availability without compromising performance.
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.
Database .NET is an innovative, powerful and intuitive multiple database management tool.
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.
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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.