CrossBox Alternatives

CrossBox is described as 'Real-time email, chat, audio/video calls & conferences, file-sharing, and contacts app with a modern and intuitive UI' and is a Mail Server in the office & productivity category. There are more than 25 alternatives to CrossBox for a variety of platforms, including Linux, Online / Web-based, Self-Hosted solutions, Windows and Mac. The best alternative is Google Workspace. It's not free, so if you're looking for a free alternative, you could try Roundcube or Nextcloud Hub. Other great apps like CrossBox are mailcow: dockerized, Zimbra Collaboration Suite, Microsoft 365 and Kolab Community.

CrossBox alternatives are mainly Mail Servers but may also be WebMail Providers or Calendar Apps. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of CrossBox.

This page was last updated

CrossBox

Paid • Proprietary
Mail Server

Online
Android
iPhone
Android Tablet
iPad
Self-Hosted

Real-time email, chat, audio/video calls & conferences, file-sharing, and contacts app with a modern and intuitive UI.

Learn more about CrossBox

Google Workspace
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No
Paid • Proprietary
Mail Server
Team Collaboration Tool
Calendar App
Mac
Windows
Linux
Online
Chrome OS
49 alternatives to Google Workspace
Google Workspace (formerly Google Apps for Work / G Suite) is Google's encompassing selection of cloud apps for business, including customizable products under custom domain names. It features traditional office tools through Google Docs as well as communication and time...
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Google Workspace Features
1. Sync with Google CalendarGoogle Workspace can be synchronized with Google Calendar
2. Two-factor AuthenticationGoogle Workspace supports two-factor authentication (2FA).
Online collaboration
Google contacts integration
Sync with Google Drive
Google Sheets integration
Integrated Bulk Emailing
Roundcube
Do you think this is a good alternative?
Yes
No
Free • Open Source
WebMail Provider
Email Client
Self-Hosted
PHP
Cloudron
28 alternatives to Roundcube
Roundcube webmail is a browser-based multilingual IMAP client with an application-like user interface. It provides full functionality you expect from an e-mail client, including MIME support, address book, folder manipulation, message searching and spell checking.
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Roundcube Features
1. WYSIWYG SupportRoundcube integrates a WYSIWYG editor to edit the look and content of a document, page, or file.
2. PGP EncryptionRoundcube supports PGP, an encryption system used for sending encrypted emails and files.
IMAP Support
Hostable
Nextcloud Hub
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Yes
No
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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mailcow: dockerized
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Yes
No
Free • Open Source
Mail Server
WebMail Provider
Linux
Self-Hosted
18 alternatives to mailcow: dockerized
mailcow is a mail server suite based on Dovecot, Postfix, SOGo, Rspamd and other open source software, that provides a modern Web UI for administration.
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mailcow: dockerized Features
1. Dark Modemailcow: dockerized supports dark mode for comfortable usage in low light conditions.
2. Ad-freemailcow: dockerized doesn't contain any form of external advertising.
3. Two-factor Authenticationmailcow: dockerized supports two-factor authentication (2FA).
4. Mail Filteringmailcow: dockerized classifies email messages according to specified criteria, allowing you to automatically recognize fraudulent or spam messages.
5. Email Organizermailcow: dockerized allows you to take control of your inbox by filtering and control tools.
6. Spam Filtermailcow: dockerized can detect unsolicited, unwanted and virus-infected emails, calls, files, etc.
7. Support for Aliasesmailcow: dockerized supports aliases, so you can receive email without exposing your main email address
Self hosted mail
Support for Docker
ActiveSync
Modular System
Dockerized
Zimbra Collaboration Suite
Do you think this is a good alternative?
Yes
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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Horde
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Yes
No
Free • Open Source
WebMail Provider
Online
Self-Hosted
40 alternatives to Horde
Horde Groupware is a free, enterprise ready, browser based collaboration suite. Users can manage and share calendars, contacts, tasks and notes with the standards compliant components from the Horde Project.
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Horde Features
CalDAV Support
Discontinued
The last release (5.2.22) was in September 2017.
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
Do you think this is a good alternative?
Yes
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