MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Refiner - Customer Feedback Surveys For SaaS
Amazon SES - Scale your business email & marketing messages with Amazon Simple Email Service (SES), a cost-effective and reliable cloud email service. Sign up today.
Simple Form - Simple Form allows you to setup forms with any kind of data
Constant Contact - Constant Contact offers email marketing, social media marketing, online survey, event marketing, digital storefronts, and local deals tools.
Survais - Non intrusive micro-surveys