1)   AnswerTool 2.3.1
Turn answers into assets! Answer your email in minutes instead of hours. AnswerTool saves your answers and lets you reuse them again and again; You will never have to worry about re-typing a response.
email response management, frequently asked question, FAQ, to do list, help desk software, customer support,

 2)   MailManager 2.0
MailManager is the leading Open Source Email Response Management product. It is used by thousands of people in call centers, business and government to help teams deal with large volumes of email to organizational addresses such as info@example.com.
Email Response Management,

 3)   VisNetic MailFlow 3.0
An easily implemented, economical and comprehensive centralized mail management and archive system. It allows emails coming in from customers to be automatically handled and routed to the appropriate employees for prompt attention.
Email, e-mail, email response management, email archive, customer relationship management, CRM, collaboration,