Auth0 - Auth0 is a program for people to get authentication and authorization services for their own business use.
SaaSiter Contacts Importer - Allow users to import contacts into their system.
Keycloak - Open Source Identity and Access Management for modern Applications and Services.
CloudSponge - Companies from every industry use CloudSponge’s Contact Picker to get access to their users’ address books.
AdiInviter Pro - The ultimate contacts importer and tell-a-friend system for your website.
Okta - Enterprise-grade identity management for all your apps, users & devices