Keila is described as 'Open Source alternative to newsletter tools like Mailchimp or Brevo.
With Keila you can easily send out newsletter campaigns and create sign-up forms.
Grow your contact lists, use custom data, and send your campaigns with Keila' and is a Email Marketing service in the business & commerce category. There are more than 100 alternatives to Keila for a variety of platforms, including Web-based, SaaS, Windows, Self-Hosted and Mac apps. The best Keila alternative is Mailchimp, which is free. Other great apps like Keila are Listmonk, Brevo, GetResponse and MailerLite.