Question: I need a passwordless authentication solution that integrates easily with my existing infrastructure, do you know of any options?

Auth0 is an adaptable authentication and authorization service that provides secure and customizable access to users. It supports passwordless authentication and works with more than 30 SDKs and Quickstarts, so it can fit in with any size enterprise. With Universal Login, Single Sign On, and Multifactor Authentication, it's a good choice for managing user identities.

Another good option is MojoAuth, a passwordless authentication service. It's focused on security and user experience, with features like security, fast login times and lots of customization. MojoAuth supports code and no-code integration so it should be easy to add to e-commerce, health care and other businesses.

LoginRadius offers a powerful customer identity service that includes support for advanced login options like passwordless login. It also includes a range of features like single sign-on, cloud-based directory services and data governance for regulatory compliance. With a cloud-native architecture designed for scalability and flexibility, LoginRadius is good for a broad range of industries.

If you're looking for a full-stack user management platform, check out Clerk. Clerk offers a range of embeddable UI components, flexible APIs and admin dashboards to manage user authentication and security. It supports multifactor authentication, social sign-on and other security features, so it's a good choice for any app.