Thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is modeled after Mozilla Firefox.
- - Thunderbird is the most popular Windows, Mac & Linux alternative to Popcorn.
- - Thunderbird is the most popular Open Source & free alternative to Popcorn.
Microsoft Outlook, part of the Microsoft 365 (Office) (not to be confused with Microsoft Outlook Express), is a personal information manager that lets you manage your e-mail, calendar, contacts, and tasks.
- - Microsoft Office Outlook is the most popular Web-based, Android, iPhone, iPad & Android Tablet alternative to Popcorn.
- - Microsoft Office Outlook is the most popular commercial alternative to Popcorn.
Microsoft Office Outlook Features
Evolution is a personal information management application that provides integrated mail, calendaring, address book and task list functionality. Evolution supports a wide range of industry standard data formats and network protocols for information exchange, with an emphasis on...
eM Client is a full featured e-mail client with a modern and easy to use interface. eM Client also offers calendar, tasks, contacts, notes and chat.
eM Client Features
There’s big news attached. The best way to manage email on a Mac, according to Apple.
Apple Mail Features
Postbox is an email application that helps you organize your work life and get stuff done.
Windows 10 has Mail and Calendar apps already built in.
Microsoft Mail and Calendar Features
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 Popcorn.
Mutt is a small but very powerful text-based mail client for Unix operating systems. Some of its features are: color support, message threading, MIME support (including RFC2047 support for encoded headers), PGP/MIME (RFC2015), various features to support mailing lists, including...
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.
Personal Information Manager (Mail, Contact, Calendar and more).