HubSpot CRM - Free CRM software for small businesses.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Less Annoying CRM - A simple customer relationship manager made just for small businesses. Manage contact info, track leads, and never miss a follow-up.
Kingmailer - Kingmailer helps you send, receive and route/forward emails.
Keap - Grow Sales. Save Time. Get Organized.
Marble Responsive Email Designer - Marble helps you design beautiful and mobile-friendly emails and newsletters.