Mailchimp Mailchimp is one way to start building your email list for free especially when you’re first starting out. It’s user friendly, fun and colorful. The free option does not include the ability to create auto-responders for an email campaign. Has an app to help manage your account on the go. http://mailchimp.com/
AWebber AWebber is another popular email marketing platform. They do not have a free option, but the monthly fee is not expensive, and many find it easier to use than mailchimp.
With both providers you can create sign up forms, campaigns and auto-responders. They also link up to paypal so that customers who buy are added to the list of your choice to receive future correspondence.
Awebber also has an app called Atom that allows you to add people to your list on the spot, on the go which is fantastic when you are traveling, at a trade show or speaking at an event. Visit websitehere.
JotForm If you want an easy way to make beautifully customized opt-in forms, this is the way to do it. Mailchimp and Awebber have yet to offer a horizontal opt in, and are limited in their form options, and Jotform is just the solution for that. It also has templates above and beyond anything you will find with Mailchimp & Awebber.
** JotForm is NOT an email marketing provider, but instead integrates with your email marketing provider (Awebber, Mailchimp, Infusionsoft etc) to link the customized opt in forms with your email marketing account, and the specific campaign you want it attached to.
HelloBar An easy to use email opt-in tool to help you convert clients. Very easy to use and offers a free version which displays a barely noticeable logo. The paid version removes the logo. East to design and brand a multitude of opt-ins and marketing campaigns including top bar, pop ups, announcements, social media director.
Can integrate with email marketing platforms such as: Aweber, Campaign Monitor, MailChimp, Constant Contact, GetResponse, iContact, MadMimi, MyEmma, Vertical Response