OBM

OBM is a free messaging and collaboration platform useful for just a couple to many thousands of users with strong support for mobile devices.

20 Alternatives To OBM

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Airtable

Airtable works like a spreadsheet but gives you the power of a database to organise anything. Airtable can store information in a spreadsheet that’s visually appealing and easy-to-use, but it’s also powerful enough to act as a database that businesses can use for customer-relationship management (CRM), task management, project planning, and tracking inventory.
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Blue-Mind

Blue Mind is a complete solution of company messaging, calendars and collaborative work.

Citadel

Is a collaboration suite (messaging and groupware).
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Expanding Communication

Turnkey Solutions for the Enterprise Cloud

Google Cloud IoT Core

A fully managed service to easily and securely connect, manage, and ingest data from globally dispersed devices

Kerio Connect

KerioConnect is a commercial mail and groupware server.

Kolab Community

Kolab Groupware is a secure, scalable, reliable, flexible, full-featured collaboration suite.

Microsoft Exchange Server

Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft.

Microsoft Teams

Microsoft Teams provides the enterprise-level security, compliance and management features you expect from Office 365, including broad support for compliance standards, and eDiscovery and legal hold for channels, chats, and files.

Niice

Niice is a canvas for creative discussion: a feedback tool that’s easier than email, and a smart, shared visual library for your team.

OpenChange

OpenChange aims to provide a portable Open Source implementation of Microsoft Exchange Server and…

SophiMail

Private email server with collaboration tools, ensures Data Portability and helps you comply with the GDPR in a cost-efficient way. Start Free trial now.

Zimbra Collaboration Suite

Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more.

eGroupWare

EGroupware is free open source groupware software intended for businesses from small to enterprises.