Weblium - Weblium is an effortless website builder that allows you to create a landing page, personal website or online store without the help of designers and programmers. Create a stylish, high-quality site that fully meets your goals and requirements.
Auth0 - Auth0 is a program for people to get authentication and authorization services for their own business use.
Unstack - Build high performance websites, blogs, and landing pages that integrate with your existing marketing stack to drive traffic, leads, and sales for your business.
Firebase Authentication - Application and Data, Application Utilities, and User Management and Authentication
10Web - All-in-one WordPress website builder
OmniAuth - OmniAuth is a flexible authentication system utilizing Rack middleware.