MailPoet newsletter plugin for WordPress. Has everything to create a newsletter that displays well on desktops and mobile devices. Includes subscribe/unsubscribe tool and mailing list management. Uses standard WordPress text and media input screen, plus it can easily import WordPress blog posts. I wanted to do a newsletter, but many that are "free" and come with pre-packaged content (e.g. Housing Trends eNewsletter) are stuffed with advertisements for other businesses and out-bound links. MailPoet has premium features, but the basic system is free.