Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Publicate - Create Successful Newsletters & Roundups
GetResponse - Email marketing from GetResponse. Send email newsletters, campaigns, online surveys and follow-up autoresponders. Simple, easy interface. FREE sign up.
SendInBlue - Innovative online Email Marketing solution to manage your contacts, create & send your newsletters and track your results. More than 80 000 clients. Best prices and attractive features.
phpList - phpList is an email and newsletter marketing tool.