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.
Some of the top features or benefits of OBM are: Open Source, Integrated Suite, Cross-Platform Compatibility, and Community Support. You can visit the info page to learn more.
Best OBM Alternatives & Competitors in 2025
The best OBM alternatives based on verified products, community votes, reviews and other factors.
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Open-Source Alternatives.
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/zimbra-alternativesZimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.
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/microsoft-exchange-server-alternativesMicrosoft Exchange Server is a messaging and collaborative software product developed by Microsoft.
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Visit websiteThe #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.
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/desknow-alternativesNetwork Solutions - Original domain name registration and reservation services with variety of internet-related business offerings. Quick, dependable and reliable.
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/kolab-community-alternativesKolab Groupware is a secure, scalable, reliable, flexible, full-featured collaboration suite.
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/cypht-alternativesAll your E-mail, from all your accounts, in one place. Cypht is like a news reader, but for E-mail.
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/cyrus-imap-alternativesThe Cyrus IMAP server differs from other IMAP server implementations in that it is generally...
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/roundcube-alternativesWeb-based IMAP email client
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/blue-mind-alternativesBlue Mind is a complete solution of company messaging, calendars and collaborative work.
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/crossbox-alternativesDesigned for those who settle only for the best — CrossBox is beautiful, dazzlingly fast, and comes with advanced features that provide you and your team with cutting-edge communication technologies.
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/iredmail-alternativesA fully fledged, free email server solution, an open source project (GPL v2).
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/openchange-alternativesOpenChange aims to provide a portable Open Source implementation of Microsoft Exchange Server and...
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/dovecot-alternativesDovecot is an open source IMAP and POP3 email server for Linux/UNIX-like systems, written with...
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/mailcow-alternativesAn open source mailserver suite.
