Kolab Community Alternatives [Page 5]

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.

Axigen is an integrated email, calendaring & collaboration platform, built on a Linux mail server technology.

The #1 email warming service to improve your deliverability by generating realistic and meaningful engagement to your emails. Easy-to-use solution to help you land in the main inbox instead of the spam folder.

Visit website paid $19.5 / Monthly (Pro)

Mailo is an email client where you can send and receive emails to and from anyone with an email address.

Self-hosted server for the ProtonMail client.

Linux directory, domain, mail, gateway and infrastructure server for SMBs.

IceWarp integrates all communication & collaboration features in one unified solution.

paid Free Trial $2.8 / Monthly (Lite)

Kontact is the integrated Personal Information Manager of KDE.

Secure email with absolutely no compromises. Get your free encrypted email account today.

freemium €5.0 / Monthly (user - 5 GB)

Turnkey Solutions for the Enterprise Cloud

Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.

Open Source

Omnichannel CRM for Businesses of all sizes

Visit website Open Source freemium $14.0 / Annually ($14 USD/monthly on Annual Subscription.)

IC Source is the advanced-level intranet software that provides you with a wide range of features to communicate with your employees and team members effectively.

Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development

Open Source