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Authentication
Login, sessions, and SSO without building it from scratch.
Auth.js
Free, self-hosted OAuth/credentials auth for Next.js and other frameworks (formerly NextAuth). Still fine for existing projects, though its own maintainers now point new projects toward Better Auth.
Auth0
The enterprise-grade option. Worth it once you need SSO/SAML across many customer orgs, not just login for your own app.
Better Auth
Self-hosted, framework-agnostic TypeScript auth library with no vendor lock-in. The current default recommendation for teams that want to own their auth code.
Clerk
Drop-in auth UI plus user/org management. Probably the fastest way to ship real auth, including SSO, without building your own screens.
WorkOS
Built specifically for B2B SaaS: SSO, SCIM provisioning, and directory sync for the enterprise deals your product will eventually need.