There are many alternatives to MongoDB for Windows if you are looking for a replacement. The best Windows alternative is PostgreSQL, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to MongoDB and loads of them are available for Windows so hopefully you can find a suitable replacement. Other interesting Windows alternatives to MongoDB are SQLite, MySQL Community Edition, MariaDB and Microsoft SQL Server.
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.
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.
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.
MariaDB is a backward compatible, drop-in replacement of the MySQL® Database Server. It includes all major open source storage engines.
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.
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.
The Apache Cassandra database is the right choice when you need scalability and high availability without compromising performance.
ArangoDB database is an open-source NoSQL solution with a flexible data model for documents, graphs, and key-values.
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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Postgres now has great support for JSON datatype with indexing, making it a very good document store - plus being the best OS relational DB.