oauth2
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The App That Failed - and the API That Learned to Drive
Two brothers tried to make an app talk to a car. The app went nowhere. The obstacle became Smartcar - a translation layer now sitting between mobility businesses and more than 40 automakers.
The Failed Forum That Became a $65 Million Bet on Owning Your Login
FusionAuth began as a test login for a forum nobody wanted. Its second act - free to download, deployable almost anywhere, and built for developers - turned an internal tool into a profitable challenger to Auth0, Okta, and the cloud giants.
ZITADEL
ZITADEL is an open-source identity and access management platform that gives developers enterprise-grade authentication and authorization without vendor lock-in. Built in Go with an API-first design and native multi-tenancy, it supports OAuth2, OpenID Connect, SAML, SCIM, passkeys, MFA and self-service flows, and can run as a self-hosted deployment or as a managed cloud service. Founded in Switzerland in 2019 and now remote-first, ZITADEL aims to make identity a foundational piece of infrastructure - like a database or a web server - rather than a barrier to shipping software.