grommunio Alternatives

grommunio is described as '(formerly known as grammm) efficiently combines all requirements of modern, digital communication and collaboration' and is a Calendar app in the office & productivity category. There are more than 10 alternatives to grommunio for a variety of platforms, including Online / Web-based, Linux, Self-Hosted solutions, Windows and SaaS. The best alternative is Nextcloud Hub, which is both free and Open Source. Other great apps like grommunio are Zimbra Collaboration Suite, Microsoft 365, Kolab Community and Kolab Now.

grommunio alternatives are mainly Mail Servers but may also be Team Collaboration Tools or Calendar Apps. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of grommunio.

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grommunio

Freemium • Open Source
Calendar App

Mac
Windows
Linux
Online
Android
iPhone
iPad
Self-Hosted

grommunio (formerly known as grammm) efficiently combines all requirements of modern, digital communication and...

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Nextcloud Hub
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Free • Open Source
Team Collaboration Tool
Calendar App
Self-Hosted
53 alternatives to Nextcloud Hub
Nextcloud is the most deployed on-premises file share and collaboration platform. Access & collaborate across your devices. As fully on-premises solution, Nextcloud Hub provides the benefits of online collaboration without the compliance and security risks.
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Nextcloud Hub Features
1. Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
2. Ad-freeNextcloud Hub doesn't contain any form of external advertising.
3. Real time collaborationMultiple users can work together in Nextcloud Hub simultaneously.
4. Extensible by Plugins/ExtensionsNextcloud Hub can be extended with add-ons, plugins and extensions.
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Zimbra Collaboration Suite
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No
Freemium • Open Source
Mail Server
Calendar App
Team Collaboration Tool
Linux
Online
Self-Hosted
43 alternatives to Zimbra Collaboration Suite
Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. With the most innovative web application available today, Zimbra boosts the productivity of users on any desktop and dramatically reduces TCO compared to legacy platform vendors.
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Zimbra Collaboration Suite Features
1. Real time collaborationMultiple users can work together in Zimbra Collaboration Suite simultaneously.
ActiveSync
Active Directory integration
Microsoft 365
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Yes
No
Paid • Proprietary
Mail Server
Project Management Tool
Online
Software as a Service (SaaS)
87 alternatives to Microsoft 365
Microsoft 365 is a subscription-based software services that licenses Microsoft Office products for on-premise or cloud-based use.
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Microsoft 365 Features
1. IFTTT IntegrationYou can connect different services to automatically trigger actions within Microsoft 365 using IFTTT.
2. Real time collaborationMultiple users can work together in Microsoft 365 simultaneously.
Document Workflow
Document sharing
Web-Based
Kolab Community
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Yes
No
Freemium • Open Source
Linux
Online
Self-Hosted
43 alternatives to Kolab Community
Kolab is entirely Free and Open Source Software (a.k.a. FOSS), and uses Open Standards. We’ll get to why this is important to us, and hope that it is important to you thereafter.
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Kolab Community Features
1. Real time collaborationMultiple users can work together in Kolab Community simultaneously.
CalDAV Support
WebDAV Support
IMAP Support
CardDAV Support
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Kolab Now
Do you think this is a good alternative?
Yes
No
Paid • Open Source
Calendar App
Mail Server
Cloud Storage Service
Online
Software as a Service (SaaS)
DAVdroid
78 alternatives to Kolab Now
Kolab Now provides a suite of intuitive apps in a user friendly environment to make your day to day online comms easier, smarter and most importantly; secure.
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Kolab Now Features
1. Support for AliasesKolab Now supports aliases, so you can receive email without exposing your main email address
2. Real time collaborationMultiple users can work together in Kolab Now simultaneously.
3. Privacy focusedKolab Now is considered a privacy friendly alternative.
4. End-to-End EncryptionKolab Now has E2E Encryption, for entire or parts of the app.
CalDAV Support
WebDAV Sync
CardDAV Support
Kopano
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No
Paid • Open Source
Mail Server
Email Client
Mobile Device Management (MDM) Tool
Mac
Windows
Linux
Online
Android
iPhone
Android Tablet
Windows Phone
iPad
Self-Hosted
Microsoft Office Outlook
S/MIME
Software as a Service (SaaS)
25 alternatives to Kopano
Kopano puts an email, video meetings, calendaring, and file sharing solution within one single interface.
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Kopano Features
1. Real time collaborationMultiple users can work together in Kopano simultaneously.
On-premises software
Shared Calendar
CalDAV Support
IMAP Support
S/MIME Support
POP3 Support
OpenChange
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No
Free • Open Source
Mail Server
Linux
30 alternatives to OpenChange
OpenChange aims to provide a portable Open Source implementation of Microsoft Exchange Server and Exchange protocols.
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OpenChange Features
Exchange
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Microsoft Exchange Server
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Yes
No
Paid • Proprietary
Mail Server
Windows
Online
45 alternatives to Microsoft Exchange Server
Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft. It is part of the Microsoft Servers line of server products and is widely used by enterprises using Microsoft infrastructure solutions.
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Microsoft Exchange Server Features
1. Real time collaborationMultiple users can work together in Microsoft Exchange Server simultaneously.
IceWarp
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Yes
No
Paid • Proprietary
Team Collaboration Tool
Group Chat App
Mail Server
Windows
Linux
Online
45 alternatives to IceWarp
IceWarp integrates all communication & collaboration features in one unified solution. Available in cloud or for on-premises deployment, IceWarp is a great tool to share and exchange all information and ideas online, offline or via mobile devices.
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IceWarp Features
1. Real time collaborationMultiple users can work together in IceWarp simultaneously.
Team discussion
Secure File Sharing
Unlimited team members
Outlook integration
Compatible with Microsoft Office
Cloud based
Document sharing
Voice Chat
Video Conferencing
Integrated File Sharing
Kerio Connect
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Yes
No
Paid • Proprietary
Mail Server
WebMail Provider
Mac
Windows
Linux
Online
17 alternatives to Kerio Connect
Kerio Connect makes email, calendars, contacts and task management easy and affordable. With Kerio Connect, you have immediate, secure access to your communications anytime, anywhere, on any device - without complexity or expensive overhead.
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Kerio Connect Features
Xmpp
Sync Contacts
POP3 Support
Calendar Sync