Top 20 products relevant to Email and Enterprise Communication

Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues.

Open Source

Gmail is available across all your devices Android, iOS, and desktop devices. Sort, collaborate or call a friend without leaving your inbox.

Get your encrypted mailbox for free.

Open Source

Zoho Mail is a secure, encrypted, and enterprise-ready email solution, a suite of apps tailor-made for your organization's needs. .

freemium $1.0 / Monthly (per user)

Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!

Email, calendars, and contacts to highest standards of security, privacy and reliability.

paid Free Trial $3.0 / Monthly (per user)

Native email app for email productivity.

Mailbird is the best email client for Windows 7, 8 and 10.

Airmail is a lightweight and lightning fast mail client for Mac.

eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat. .

freemium

Mailspring is a mail client for Mac, Windows and Linux.

Open Source

KerioConnect is a commercial mail and groupware server.

Full-featured email service with integrated security to safeguard your data.

Apps/Evolution - GNOME Wiki!

Superhuman is an email management tool.

The Power Email App for busy professionals, like you.

Web- and IMAP-based email service. 2GB cost 1€/month.

Privacy-aware email app for Mac & iOS.

Web-based IMAP email client.

Open Source

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