NoPass.me - Open-source identity verification
Siberian CMS - Siberian is an Open-Source and Free App Maker. Unlimited Push Notifications. Unlimited features. Fully Customizable. Download it and build your own app now!
Amazon Cognito - Amazon Cognito lets you add user sign-up, sign-in, and access control to your web and mobile apps quickly and easily. It scales to millions of users and supports sign-in with social identity providers and enterprise identity providers via SAML 2.0.
GoodBarber - GoodBarber is a mobile app creation platform.
Civic Token - Access to identity verification via the blockchain
Bizness Apps - Create your own app or become a reseller and build apps for others