Envoy - Visitor registration that's changing how guests are greeted in companies around the world.
Clearbit - Clearbit provides Business Intelligence APIs
Proxyclick - Connect with Confidence
Memotoo - Memotoo allows you to sync your data (contacts, calendar, tasks, .) with phones (iPhone, Android, Samsung, ..
TractionGuest - Safe, secure workplace for all.
Google Contacts - Google Contacts is Google's contact management tool that is available in its free email service Gmail, as a standalone service, and as a part of Google's business-oriented suite of web apps Google Apps.