grommunio is described as '(formerly known as grammm) efficiently combines all requirements of modern, digital communication and collaboration' and is a Mail Server in the office & productivity category. There are more than 10 alternatives to grommunio for a variety of platforms, including Web-based, Linux, Self-Hosted, SaaS and Windows apps. The best grommunio alternative is Nextcloud Hub, which is both free and Open Source. Other great apps like grommunio are Kolab, SOGo, Zimbra Collaboration Suite and Horde.
Web-based team collaboration suite combining email client, calendar, contact and task tools, CRM, project and file management, file sharing, trouble tickets, Rocket.Chat chat, and Collabora online editing. Offers open source, self-hosted, and SaaS options.
Germany
EU
All-in-one European business email and collaboration platform — email, chat, video conferencing, and office suite in one app. Cloud or self-hosted.
CzechiaEU
Atmail webmail system offers a webmail client, email server platform and mailserver appliance for Linux, Unix and Windows.
Australia
