si.Mail Alternatives
si.Mail is described as 'Published under GPL (you don’t have to pay for it if you are using it, full source code availability)' and is a Email Client in the Office & Productivity category. There are seven alternatives to si.Mail for a variety of platforms, including Windows, Linux, BSD, Mac and PortableApps.com. The best alternative is Thunderbird, which is both free and Open Source. Other great apps like si.Mail are Microsoft Office Outlook (Paid), Claws Mail (Free, Open Source), Kontact - KMail (Free, Open Source) and Sylpheed (Free, Open Source).
- 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
- Mac
- Windows
- Linux
- BSD
- PortableApps.com
- Haiku
- Microsoft Outlook, part of the Microsoft Office Suite (not to be confused with Microsoft Outlook Express), is a personal information manager that lets you manage your e-mail, calendar, contacts, and tasks.
- Paid • Proprietary
- Mac
- Windows
- Online
- Android
- iPhone
- Android Tablet
- Windows Phone
- iPad
- Apple Watch
- Android Wear
- Claws Mail is an email client (and news reader), based on GTK+, featuring
- 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.
- Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client (mailer, MUA).
- Free • Open Source
- Mac
- Windows
- Linux
- BSD
- PortableApps.com
- The Bat! is a secure email client software, built to protect your correspondence against third-parties.
- Paid • Proprietary
- Windows
- S/MIME
- OpenPGP
- Pegasus Mail is a free, standards-based electronic mail client suitable for use by single or multiple users on single computers or on local area networks.
- Free • Proprietary
- Windows