25. Kualo MailMachine
This list-building tool lets you create your email list, manage opt-in processes and import contacts or set sign-up forms on your website. Features include ready-made templates, autoresponders, A/B split tests and a dashboard view for email campaign reports. The "Forever Free Plan" is good for up to 2,000 subscribers (15,000 emails per month). A discreet MailMachine badge is embedded in all email footers on the free plan. Upgraded plans start at $10 per month.