MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Product School - The global leader in product management training
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.
The Product Manifesto - Product Managers face the biggest challenges of our day, which is why our community needs a common set of product principles.
Constant Contact - Constant Contact offers email marketing, social media marketing, online survey, event marketing, digital storefronts, and local deals tools.
Intercom on Product Management - The ultimate resource for aspiring product managers