Our great sponsors
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Mailspring-Libre
(archived) Mailspring Libre build – aiming at removing Mailspring's dependecy on a central server
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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.
I've just started using Mailspring-Libre. I've only used it for basic scenarios so far but I have no complaints. I can't speak for power-user features yet.
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.