I have personally used Post Affiliate Pro for almost 2. While I had some small issues, the customer support team quickly resolved them. The software is pretty affordable and has a lot of excellent features and many, many integrations. We took the advantage of free set-up and integration, which was a very nice gesture from the company.
17hats - The all-in-one business system for entrepreneurs.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Optmyzr - Optmyzr AdWords Tools. Optimization Solutions, Quality Score Tracker, Landing Page Checker, and more. Free Trial Available.
ActiveCampaign - Integrated email marketing, marketing automation, and small business CRM. Send beautiful newsletters, setup behavioral based automations, and benefit from sales automation.
LiveIntent - LiveIntent is a web platform that offers effective e-mail advertising services for marketers and publishers.
BirdSend - BirdSend is the email marketing software that allows you to create beautiful and appealing marketing campaigns, and achieve the desired results.