MailerLite - Affordable Email Marketing Software. Get all features (Segmentation, Automation, A/B testing) for up to 1,000 subscribers & send unlimited emails for free!
Froged - One click solution providing easy-to-use marketing, sales and support services to turn website visitors into happy customers.
GetResponse - Email marketing from GetResponse. Send email newsletters, campaigns, online surveys and follow-up autoresponders. Simple, easy interface. FREE sign up.
Intercom on Customer Engagement - A book on how to create messages that drive engagement
Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES
Keep Your Friends Close - A free e-book about maximizing Customer Lifetime Value