Our great sponsors
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Mailspring
:love_letter: A beautiful, fast and fully open source mail client for Mac, Windows and Linux.
Hello, sorry you will probably have to build mailspring from source..
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SOGo
SOGo is a very fast and scalable modern collaboration suite (groupware). It offers calendaring, address book management, and a full-featured Webmail client along with resource sharing and permission handling. It also makes use of documented standards (IMAP, CalDAV, CardDAV, etc.) and thereby provides native connectivity (without plugins) to many clients such as Microsoft Outlook, Apple iCal, the iPhone, Mozilla Lightning, and a plethora of mobile devices.
Have a look at https://sogo.nu/
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SonarLint
Clean code begins in your IDE with SonarLint. Up your coding game and discover issues early. SonarLint is a free plugin that helps you find & fix bugs and security issues from the moment you start writing code. Install from your favorite IDE marketplace today.
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BTW, ProtonMail web client is open-source.
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Mailpile supports theming. https://github.com/mailpile/Mailpile/wiki/Themes
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