SOGo is described as 'Is groupware server with a focus on scalability and open standards' and is a webmail provider in the office & productivity category. There are more than 50 alternatives to SOGo for a variety of platforms, including Web-based, Self-Hosted, Windows, Linux and Mac apps. The best SOGo alternative is Roundcube, which is both free and Open Source. Other great apps like SOGo are Mailpile, Wrike, monday.com and Baïkal.
Automatically sync calendars and contacts between Thunderbird, Outlook and Android devices, without using the cloud or servers.
grommunio (formerly known as grammm) efficiently combines all requirements of modern, digital communication and collaboration.
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.
Open Atrium is a Drupal distribution that allows you to confidently engage with your colleagues through convenient collaboration.
OneDeck is a smart, intelligent and automated platform for all your business management needs. With OneDeck, you can streamline your workflow, enhance collaboration, and improve communication, all in one place.
Planview AdaptiveWork, previously Clarizen, is a solution that provides project management offices (PMOs) and service delivery teams with task visibility. It automates workflows, manages risks, and delivers business impact.
NexMail is an open-source, modern webmail client designed for self-hosted email servers. Enjoy a clean, intuitive interface with powerful features for managing your emails efficiently.
Adaptive suite integrating project, IT service, and source code management for technology teams, featuring time tracking, issue and document management, customizable dashboards, third-party integration, agile and waterfall support, and cloud deployment options.
ClockingIT is a free hosted application, keeping track of all your tasks and the time you spend on them. Extensive features Project Management, Collaboration and Time Tracking
...and its free!
Plan your projects, see your schedule, know if youre slipping behind and why.
Time.
SquirrelMail is a standards-based webmail package written in PHP. It includes built-in pure PHP support for the IMAP and SMTP protocols, and all pages render in pure HTML 4.0 (with no JavaScript required) for maximum compatibility across browsers.
All your E-mail, from all your accounts, in one place. Cypht is like a news reader, but for E-mail. Cypht does not replace your existing accounts - it combines them into one. And it's also a news reader :).
Collabtive is for project management and SOGo for calender,adressbook and email
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SOGo is for calendar, email, and contact, not project management.