Conversational Marketing University - Free courses on how to grow your business with conversations
EmailOctopus - Email marketing for less, via Amazon SES
Flight School by Autopilot - Learn the secrets of growing your business online
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Product Hunt - A website that lets users share and discover new products
.meteoremails - Send cold emails for free! Free and open source project