Alternatives to Spark for Linux with any license

Thunderbird

Thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is modeled after Mozilla Firefox.
- works like an old email client, downloading the message and saving in folders. It doesn't work syncing directly online with gmail labels. Guest • Mar 2019 • 4 agrees and 1 disagrees
- There is NO Spark Version for Windows. That's why Thunderbird is the Best Alternative IMO. Guest • Apr 2018 • 8 agrees and 5 disagrees
- Thunderbird is buggy, frequently locks up, slow and takes long to update from server. Spark is fast, easy and beautiful Guest • Mar 2017 • 20 agrees and 4 disagrees
Free Open Source Mac Windows Linux BSD PortableApps.com ... Haiku
Extensible by Plugins/Extensions Built-in RSS reader Calendar integration Support for IMAP ... Multiple Account support Open Source apps SMTP integration Add-ons Built-in Calendar Categories Customizable Delivery reports Encryption Extensible by Plugins/Extensions Free API Gmail integration Google Calendar integration Import from Google Reader HTML Compose Integrated Chat Integrated Password Manager Integrated Web Browser Legacy addons support Open source software Export to OPML Import feeds from OPML Protected by Password POP3 Support Portable Secure File Sharing Tabbed interface Support for Themes Add a feature

1922 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...
- It's the most similar, with the features most inline. It even looks the same in appearance, and all the menus and shortcut keys match. Guest • Mar 2018 • 1 agrees and 1 disagrees
Freemium $ $ $ Mac Windows Linux Arch Linux Fedora ... Ubuntu
Multiple Account support Unified inbox Email tracking Night mode/Dark Theme ... Customizable Drag n drop Email Analytics Extensible by Plugins/Extensions Support for IMAP Night mode/Dark Theme Theme Customization Support for Themes Threaded Conversations Add a feature

57 Like
Claws Mail

Claws Mail is an email client (and news reader), based on GTK+, featuring Quick response Graceful, and sophisticated interface Easy configuration...

Free Open Source Windows Linux BSD
Lightweight Built-in RSS reader Content Filtering Customizable ... Extensible by Plugins/Extensions Support for IMAP Integrated Email Client Multiple languages Multiple Account support Add a feature

86 Like
BlueMail

BlueMail is a modern, mobile first, powerful Email management tool with a sleek design, unified inbox and support for all your accounts: IMAP,Exchange,POP3.

Free Personal $ $ $ Mac Windows Linux Android iPhone ... Chrome OS Android Tablet iPad Apple Watch
Ad-free Calendar integration Support for IMAP POP3 Support ... Unified inbox Add a feature

14 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...
- Discontinued On its github page it states it is archived and is no longer maintained.
Free Open Source Mac Windows Linux Self-Hosted
Extensible by Plugins/Extensions Multiple Account support Add a feature

3 Like
Hiri

Fast, good looking email client. Lighter than MS Outlook with some unique and clever features. Works ONLY with Outlook / Exchange.

Commercial $ $ $ Mac Windows Linux
Calendar integration Office 365 integration Convert Email to Task Add a feature

31 Like
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
No features added Add a feature

4 Like
Columba

Columba is an email client written in Java, featuring a user-friendly graphical interface with wizards and internalionalization support. Its a powerful mail management...
- Discontinued The project is no longer developed. Last version, 1.4, released in March 2007, can be still downloaded from SourceForge.
Free Open Source Mac Windows Linux BSD
No features added Add a feature

3 Like