HotDocs might be a bit more popular than EmailJS. We know about 1 link to it since March 2021 and only 1 link to EmailJS. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Check out emailjs.com, might do what you want. Source: almost 2 years ago
There are others like hotdocs.com or xpertdoc.com but I've never checked them out. Source: about 3 years ago
PHPMailer - Email sending library for PHP.
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docassemble - docassemble is a free, open-source expert system for guided interviews and document assembly.
Mailgun - A set of powerful APIs that enable you to send, receive and track email from your app effortlessly whether you use Python, Ruby, PHP, C#, Node.js or Java.
Knackly - Generate contracts, emails, or other documents of any complexity by automating your knack for doing...