Inbox by Gmail is a new app from the Gmail team. Inbox is an organized place to get things done and get back to what matters. Bundles keep emails organized.

Instantly see a list of all your subscription emails. Unsubscribe easily from whatever you don’t want.

Kopano is an open-source groupware application suite originally based on Zarafa.

HappyFox is an Online help desk software and a web based support ticket system.

Newton is a multi-platform email client which supports multiple email providers.

IQTELL is a productivity app that allows users to manage email, tasks, projects, calendars, contacts, Evernotes and more in a single app.

Help Scout is an email-based customer support platform, knowledge base tool, and an embeddable search/contact widget for customer service professionals.

Firmao CRM is a business software includes modules like online crm (customer relationship management), projects and tasks management, invoicing and many more.