Kube

Kube is a modern communication and collaboration client built with QtQuick on top of a high performance, low resource usage core. It provides online and offline access...

Free
Open Source
Linux

Kube is a 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. With a strong focus on usability, the team works with designers and UX experts from the ground up, to build a product that is not only visually appealing but also a joy to use.

Links to official Kube sites

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The Best 10 Kube Alternatives

multiple-account-support filter is active.

1709 Like

Thunderbird

thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. the project strategy is modeled after mozilla firefox.

Free Open Source Windows Linux BSD Mac Haiku

Customizable Extensible by Plugins/Extensions Portable Integrated Chat Built in RSS reader Calendar integration Free API Import from Google Reader Integrated Web Browser Multiple Account support Export to OPML Import feeds from OPML POP3 Support Tabbed interface
269 Like

Mailbird

Mailbird is more than just another email client - It's an all-in-one communication platform for email, contacts, calendar, apps, task management, video meetings and much more. Try it free, today.

Freemium Windows

Sync Contacts GSuite Integration Multiple Account support Slack integration Dropbox integration Facebook integration Asana integration Conversation view Trello integration Twitter integration Undo send Unified inbox
165 Like

K-9 Mail

K-9 is an open source email client for Android with multi-folder sync, email signatures, Bcc-to-self, return-address configuration, keyboard shortcuts, Exchange Support, message flagging, IMAP deletes, saving attachments, configurable...

Free Open Source Android Android Tablet

Privacy focused Ad free Multiple Account support PGP Encryption
128 Like

Postbox

Postbox is an email application that helps you organize your work life and get stuff done. It has all the elegance and simplicity of Apple Mail, but with more power and flexibility to manage even the most demanding workloads.

Commercial Mac OS X Windows

Extensible by Plugins/Extensions Support for IMAP Multiple languages Built in RSS reader Multiple Account support POP3 Support Tabbed interface Onedrive integration Dropbox integration Box.com integration
20 Like

Polymail

The most powerful platform for email productivity in a beautiful native app — on desktop and mobile.

Freemium Mac OS X iPhone iPad

Sync Contacts Multiple Account support Email tracking Email scheduling
20 Like

Astro

Modern email and calendar apps for Mac, iOS, Android, Slack and Alexa, powered by Artificial Intelligence. Astro keeps you focused on what's most important.

Free Android iPhone iPad Mac Slack Amazon Echo (Alexa Voice Service)

Calendar integration Multiple Account support Email tracking Google Calendar integration Snooze reliability
17 Like

Mailspring

Boost your productivity and send better email with Mailspring, a beautiful, fast email client for Mac, Windows, and Linux. Mailspring is free to use and an optional pro version adds read receipts, send later, reminders and more.

Freemium

Customizable Extensible by Plugins/Extensions Support for IMAP Sync Contacts Multiple Account support Drag n drop Support for Themes Dark theme Conversation view Unified inbox Email tracking Email Analytics Email tracking & analytics
16 Like

Shift

Shift is an email client that makes navigating between Mail, Calendar, Drive + your favorite Apps & Extensions easy (for Gmail, Outlook.com - Office 365 & Hotmail). .

Freemium

Multiple Account support Gmail integration Sync with Google Calendar Sync with Google Drive Cross account search Google Apps integration
2 Like

Nylas Mail Lives

nylas mail lives is a fork of nylas mail that fixes many longstanding issues, improves the client experience, and is committed to...

Free Open Source Mac OS X Windows Linux Self-Hosted

Extensible by Plugins/Extensions Multiple Account support
1 Like

InboxZero

Email conversations InboxZero automatically gathers your emails in conversations by contact. You can quickly browse all your emails exchanged with a contact in one...

Free Mac OS X Windows Android iPhone iPad

Portable Multiple Account support POP3 Support

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Kube

Links to official Kube sites

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The Best 10 Kube Alternatives

Thunderbird

Mailbird

K-9 Mail

Postbox

Polymail

Astro

Mailspring

Shift

Nylas Mail Lives

InboxZero

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