HubSpot CRM - Free CRM software for small businesses.
Invoca - Call tracking & analytics software
Less Annoying CRM - A simple customer relationship manager made just for small businesses. Manage contact info, track leads, and never miss a follow-up.
CallTrackingMetrics - Know who is calling and how they found you. Maximize the return on your advertising.
Keap - Grow Sales. Save Time. Get Organized.
Marchex - Marchex is a mobile advertising analytics company that connects online behavior to real-world, offline actions.