HEML Is an Open Source tool for generating responsive HTML (rich text) email messages. Most of the time this is not really needed as its functionality is included in your autoresponder of choice which might be, for example
Where this tool comes into its own is where you need to generate a well laid out email programatically . Maybe you are setting up a serverless application or registration system and want the emails to look professional and easy to read.
This is a mature, active, commercially supported open source project with comprehensive and well written documentation. A worthy addition to a developer’s toolbox. Any developer can use it to easily differentiate their service and skills from the competing pack.