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.
GNU Health - GNU Health is a Free/Libre project for health practitioners, health institutions and governments.
Free Address Book - In our contact management software you can store fast and easily name, phone numbers, birthdays, address, company name, city, mobile numbers, insurance and loan info, e-mail addresses.
OpenEMR - OpenEMR is an open source electronic health records and medical practice management solution.
Clearbit - Clearbit provides Business Intelligence APIs
OpenMRS - OpenMRS is a community-developed, open source, enterprise electronic medical record system platform.