Our great sponsors
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HtmlSourceEditor
Based on Stationary 1.0.0 - Allows to edit the HTML source while composing a message
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
So, I tried formatting an HTML mail in Thunderbird. I needed an extension to do that. HTML Source Editor did the job for me as a web developer.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.