Sidekick by Hubspot - Customer insight integrated with your email tools.
HubSpot CRM - Free CRM software for small businesses.
HiHello - Exchange contacts, seamlessly.
Keap - Grow Sales. Save Time. Get Organized.
Sansan - Sansan provides a internal contact sharing service for companies.
Less Annoying CRM - A simple customer relationship manager made just for small businesses. Manage contact info, track leads, and never miss a follow-up.