Keila is an open-source newsletter tool for managing contacts and sending personalized campaigns. You can design emails with a visual editor, Markdown, MJML or plain text. Sign-up forms, custom contact fields and segments help organize subscribers and target campaigns.
You can self-host Keila or use Keila Cloud, which the provider says is hosted in Germany and France. Tracking can be disabled, and double opt-in is available for sign-ups. An API connects contacts and campaigns with other tools; hosting and email-delivery costs depend on your setup.
Source: Product overview
