HubSpot Free Email Marketing - Powerful drag and drop email marketing in the HubSpot CRM
Vero Newsletters - The first "baseless" email marketing tool.
SaaS Email Marketing Handbook - Double Your MRR With Email Marketing
Elevatr Email Marketing Automation - Fast and easy email marketing software
MailBluster - Email Marketing Software Using Amazon SES
Google Sheets Email Marketing - Email automation and validations directly from Google Sheets