Kube is described as 'Modern communication and collaboration client built with QtQuick on top of a high performance, low resource usage core. It provides online and offline access to all your mail, contacts, calendars, notes, todo's and more' and is a Email Client in the office & productivity category. There are more than 25 alternatives to Kube for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best Kube alternative is Thunderbird, which is both free and Open Source. Other great apps like Kube are K-9 Mail, Betterbird, Evolution and FairEmail.
Mailpile is a 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 is and will be released under an OSI approved Free Software license.
Mailpile is the most popular Self-Hosted alternative to Kube.
Shift consolidates web applications into one platform, simplifying access to Google and Microsoft accounts. It declutters tabs, supports email management for Gmail and Outlook 365, integrates with extensions like Grammarly, LastPass, and more, while providing custom notifications and quiet hours.
KMail is the email component of Kontact, the integrated personal information manager of KDE. Kontact is a personal information manager and groupware software suite for KDE. It supports calendars, contacts, notes, to-do lists, news, and email.
The free Zimbra Desktop client allows you to meld the online and offline worlds – storing and synching your email, calendar, contacts, files and documents in the cloud, yet having them locally accessible when on the road.
The Bat! is a secure email client software, built to protect your correspondence against third-parties.
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.
LucaMail is an open source, cross-platform email client. LucaMail is developed to provide cross-platform alternative to Email Clients that are really exists. LucaMail focuses on modern technologies as well as maintaining a user-friendly UI.
No-frills, easy to use, easy to maintain Email client for Android based on the JSON Meta Application Protocol (JMAP).
Productivity browser featuring unified webmail, website, and web app management, isolated multi-account support, vertical sidebar with grouping, memory-saving tab sleeping, app-to-app linking, built-in chat and screenshare, collaboration workspaces, and strong security.
Productivity-centered email application streamlines inbox management, uses AI for drafting responses, automates snippets, summarizes conversations, enables timely sends, integrates calendar and CRM, and includes collaborative features like live views and comments.
The most powerful platform for email productivity in a beautiful native app — on desktop and mobile.
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