Clearbit - Clearbit provides Business Intelligence APIs
CiviCRM - A Constituent relationship management for the Civic Sector
Memotoo - Memotoo allows you to sync your data (contacts, calendar, tasks, .) with phones (iPhone, Android, Samsung, ..
Odoo CRM - Open Source CRM
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.
WORKetc CRM - All-in-one business management system. CRM + Social + Projects + Billing