Mailpile is described as 'Modern, fast web-mail client with user-friendly encryption and privacy features. The development of Mailpile is funded by a large community of backers and all code related to the project d will be released under an OSI approved Free Software license' and is a very popular Email Client in the office & productivity category. There are more than 50 alternatives to Mailpile for a variety of platforms, including Web-based, Linux, Windows, Self-Hosted and Mac apps. The best Mailpile alternative is Thunderbird, which is both free and Open Source. Other great apps like Mailpile are Tuta Mail, Betterbird, Microsoft Outlook and Evolution.
Enterprise-level, browser-based suite for IMAP email, calendar, contacts, tasks, notes, wiki, and file management, offering syncing, shared and unlimited resources, multilingual support, customizable dashboard, and integration with mobile and external clients.
Trojitá, is a fast Qt IMAP e-mail client that respects open standards and facilitates modern technologies. Trojitá values vendor-neutrality that IMAP provides and is committed to be as interoperable as possible.
Kolab Now provides a suite of intuitive apps in a user friendly environment to make your day to day online comms easier, smarter and most importantly; secure.
Mail is designed to let you manage your email quickly and effortlessly. Its interface is based on conversations, so you can read an entire discussion without having to click from message to message.
Runbox offers email hosting, domain hosting, and web hosting services, as well as custom-made email solutions
Countermail is a web-based email service. It is hosted in Sweden. Its focus is on privacy. It provides several features, such as PGP support and diskless servers to protect users ability to communicate securely and anonymously.
Project was acquired by another company and converted into generic end-to-end encryption software
The Beeble Project is email and online cloud storage platform with unprecedented security and privacy without third party access.
Finally, an email service that's built around your privacy. Get your @criptext.com email address and see what it's like to have peace of mind and privacy in every email you send.
NexMail is an open-source, modern webmail client designed for self-hosted email servers. Enjoy a clean, intuitive interface with powerful features for managing your emails efficiently.
Open Source WebMail Lite is a free community edition of full-featured WebMail Pro server application intended for users who need a clean and simple web mail application, which is fast and easy to use. Whether you need a free web browser based email client software for Windows ASP.
Czechia
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Wonderful GUI for open source!