Columba Alternatives

Thunderbird is a free, open-source, cross-platform email, news and instant messaging client. The project strategy is modeled after Mozilla Firefox. Features:Free,Open,Source,Mac,Windows,Linux,BSD,

(Not to be confused with Microsoft Office, Outlook) - Office-Online Outlook.com it is a part. Features:Freemium,Web,Chrome,OS

To manage as part of the Microsoft Office Suite, Outlook E-Mail, calendar, contacts, and tasks from the personal information manager that allows you. Features:Freemium,Mac,Windows,Web,Android,iPhone

Mailbird e-mail, contacts, calendar, apps, task management, video meetings a communication platform allinone more than just an E-Mail client, and Features:Freemium,Windows

The big news is connected. OS X Yosemite on a Mac will be better with the best way to manage E-Mail better. Features:Free,Mac,iPhone,iPad

K9 multi-folder sync, email signatures, Microsoft, return-address configuration, keyboard shortcuts, exchange support for Android is an open-source e-mail client Features:Free,Open,Source,Android,Android,Tablet

A modern and easy-to-use interface eM Client is a full-featured E-Mail client. eM-Client, calendar, tasks, contacts and chat features. Features:Freemium,Windows

Evolution is the official personal information manager and workgroup information management tool for GNOME. E-mail, calendar, address book, task list United Features:Free,Open,Source,Linux,BSD,S/MIME,GNOME,OpenPGP

Postbox helps you do things and to organise the life of an e-mail application. Elegance and simplicity of Apple Mail, but with more power Features:Commercial,Mac,Windows

Opera mail force organized fully, indexes, and queues messages. (Both automated and Bayesian) spam filtering, supports POP3 and IMAP, as messages Features:Free,Mac,Windows,

Claws Mail-and News-Reader), GTK+ - based, this is a fast reaction with an elegant e-mail client interface, simple configuration and advanced Features:Free,Open,Source,Windows,Linux,BSD

Geary is a Gnome 3 is built for e-mail application. Read with a modern interface and easy to use, and send an e-mail. Features:Free,Open,Source,Linux,BSD,GNOME

With all the great features of the e-mail application: (Long/Short), beer, confectionery, cloud, and support for various E-Mail services (multiple) attachments.add Features:Free,Mac,iPhone,iPad,Apple,Watch

Open project-properties, and a large group of plugins and effectively is an open-source software for project management, with the international community. More project-timeline / Gantt charts, issue tracking, wiki, document management, time and cost reporting, code management, Scrum and so on. Features:Freemium,Open,Source,Web,Self-Hosted,Ruby,Cloudron

Mutt Unix operating systems, a small but very powerful text-based e-mail client. Some of the features, including color support, message threading, mime support (: Features:Free,Open,Source,Mac,Windows,Linux,Xfce