• Auth0
• AuthKit (WorkOS)
• Authress
• Auth.js
• Authentik
• BoxyHQ
• Casdoor
• Clerk
• Cognito
• Descope
• Firebase
• Frontegg
• FusionAuth
• Keycloak
• Kinde
• Logto.io
• Magic.link
• ORY
• Pangea
• PropelAuth
• Rownd
• ScaleKit
• Slashid
• Stack Auth
• Stytch
• Strivacity
• Supabase Auth
• Supertokens
• UserFront
• Wristband
• Zitadel
I work at WorkOS and we naturally think AuthKit is the best solution. It's also free up to 1,000,000 users and supports advanced features like SAML/SCIM/RBAC/etc. https://AuthKit.com