There are 1 open-source alternatives to FusionAuth in this directory. The most popular is Authgear-server with 1.6k GitHub stars. All are open source, free to use, and many can be self-hosted.
The top three are Authgear-server(1.6k stars). All are open source and free to use.
Yes. Every tool listed here is open source and free to use in your own projects. Many can be self-hosted on your own infrastructure, which means no subscription fees and full control over your data.
Many of the alternatives listed are self-hostable. Each tool's page lists hosting details, system requirements, and licensing terms.
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