Zimbra is the most capable open source email and collaboration suite available today. It provides support for Email, Shared calendar, Document management, Pop3, Address book and lot more. Mails could be tagged and search support is also provided. Zimbra is considered as an alternative to Microsoft Exchange Server.

Zimbra - Email and Collaboration Suite

Alfresco is the open source alternative for Enterprise Content Management (ECM), providing Document Management, Collaboration, Records Management, Knowledge Management, Web Content Management, Image Management, Content Repository, Workflow. It supports CIFS interface to provide file system compatibility on Microsoft Windows and Unix-like operating systems. Alfresco is a content management framework where it could act as backend to store and retrieve the content. API support is available. <img src="/AppImages/Article/alfresco-img1.jpg" alt="" class="float-center">

Alfresco is the open source alternative for Enterprise Content Management (ECM), providing Document Management, Collaboration, Records Management, Knowledge Management, Web Content Management, Image Management, Content Repository, Workflow. It supports CIFS interface to provide file system compatibility on Microsoft Windows and Unix-like operating systems.

Alfresco - Enterprise Content Management System

Liferay Digital Experience Platform is an enterprise-grade platform that enables companies to create and connect personalized digital experiences across web, mobile, social, in store and other touchpoints. It provides the technical foundation (deep integration, security and modularity) for your digital business to orchestrate unique customer experiences, as well as business value features to support a deeper understanding of your customers

Liferay Digital Experience Platform (DXP)

TeamLab is a platform for business collaboration and project management. Its features include Project management,  Tasks management, Reports, Events, Blogs, Forums, Bookmarks, Wiki, Instant Messenger, Document Management, CRM and more.

Teamlab - Business Collaboration and Project Management in ASP.NET

LogicalDOC is a modern document management system with a nice interface, easy to use and very fast. It uses open source Java frameworks such as Spring, Hibernate and Lucene in order to provide a flexible and scalable DMS solution. Thanks to the most advanced presentation technology, LogicalDOC offers an unrivaled user experience with a refined and responsive interface.
 
A rich set of APIs is available for integration with third-party applications via webservice. On the website of LogicalDOC you can also download the commercial version of the software with a set of additional features.
 
<img src="/AppImages/Article/logicaldoc-screenshot_sm.png" alt="" class="float-left">

LogicalDOC is a modern document management system with a nice interface, easy to use and very fast. It uses open source Java frameworks such as Spring, Hibernate and Lucene in order to provide a flexible and scalable DMS solution. Thanks to the most advanced presentation technology, LogicalDOC offers an unrivaled user experience with a refined and responsive interface.

LogicalDOC Document Management - DMS

Feng Office is a web based collaboration platform. It helps to manage your projects and business services, Collaborate with your team and your customers, Organize and share documents and files. Feng Office allows businesses to manage project tasks, billing, documents, communication with co-workers, customers and vendors, schedule meetings and events, and share every kind of electronic information. 

Feng Office allows you to store and share all types of documents. Text documents and presentations can be created or edited directly in Feng Office without the requirement of any additional software in your computer. Tasks and milestones could be tracked.

Feng Office is a web based collaboration platform. It helps to manage your projects and business services, Collaborate with your team and your customers, Organize and share documents and files. Feng Office allows businesses to manage project tasks, billing, documents, communication with co-workers, customers and vendors, schedule meetings and events, and share every kind of electronic information.

Feng Office -  A Collaboration Platform and online office

Nuxeo DM manages and tracks the flow of content through the business cycle, addressing the common pitfalls of document duplication, lack of version tracking, time-consuming search and retrieval, and security and access issues. It captures content with different formats like scanned images, email, office documents, CAD files etc. Audit logging and configurable versioning policies helps to to track the content lifecycle. 
 Community site: <A HREF="http://community.nuxeo.com/" target="_blank">http://community.nuxeo.com/</A>

Nuxeo DM manages and tracks the flow of content through the business cycle, addressing the common pitfalls of document duplication, lack of version tracking, time-consuming search and retrieval, and security and access issues. It captures content with different formats like scanned images, email, office documents, CAD files etc. Audit logging and configurable versioning policies helps to  to track the content lifecycle.

Nuxeo Document Management

OpenDocMan is a free, open source web-based PHP document management system (DMS) designed to comply with ISO 17025 and OIE standard for document management. It features include Add any file type to the system, Maintains revision history, Workflow, Full text search, Fine grained control of access to files, Automated install and upgrades.

OpenDocMan - Document Management System in PHP

OpenKM is a web base document management application that uses standards and Open Source technologies. OpenKM provides full document management capabilities including version control and file history, metadata, scanning, workflow, search, and more. 

OpenKM - Knowledge Management

Cloud File Browser is a javascript library to connect to Document Hub provider (e.g. Dropbox, Box, Google Drive) by creating Cloud Elements instances, this library uses nodejs on the backend for connecting to Cloud Elements API by not exposing any keys or tokens to outside world.

Cloud Filebrowser - Access documents from Box, Dropbox, Google Drive and Onedrive

eXo Platform is an open-source social-collaboration software designed for enterprises. It is full featured, based on standards, extensible and has an amazing design. Rich collaboration features such as wikis, forums, calendars and documents are smartly integrated around activity streams, social networking and workspaces. 
 
The platform has been carefully designed to instantly engage users. It runs on the Cloud or within the trusted security of an enterprise platform and is highly customizable to adapt when your needs evolve. eXo Platform has inherited strong document management capabilities from its portal platform roots and thus is also a fantastic platform for content-centric applications. Based on standard and highly extensible, eXo Platform also rely on community add-ons to bring users new capabilities like chat application, blog management and Google Drive extensions.

eXo Platform is an open-source social-collaboration software designed for enterprises. It is full featured, based on standards, extensible and has an amazing design.

eXo Platform - The Enterprise Social Platform

ONLYOFFICE is a multi-featured open source office suite, that features online document editors, platform for document management, corporate communication, mail and project management tools.
 
 It consists of three parts 
Document server is online office suite, which includes editors for texts, spreadsheets and presentations, fully compatible with MS Office and other popular formats. It also offers a lot of collaborating capabilities (real-time co-editing, commenting, reviewing, built-in chat). It can be installed as a part of the ONLYOFFICE system or stand alone and connected to popular cloud storage like Nextcloud, ownCloud, Alfresco, ect. 
Community Server collaborative system, which contains project and document management systems, Ghantt chart, CRM, calendar and email aggregator. 
Mail Server is a full-featured mail server solution developed on the base of the iRedMail package. it allows you to connect your own domain name, create mailboxes and add aliases for each mailbox.

ONLYOFFICE is a multi-featured open source office suite, that features online document editors, platform for document management, corporate communication, mail and project management tools.

ONLYOFFICE  - MultiFunctional Office Suite

CaseBox is a platform to build a content management system for managing records, tasks and files. It supports ACLs, Task management, Full text search, Monitoring, Import legacy data and lot more.

CaseBox - Content management platform Manage records, tasks, files.

Paperless is an application by Daniel Quinn and contributors that indexes your scanned documents and allows you to easily search for documents and store metadata alongside your documents. It performs OCR on your documents, adds selectable text to image only documents and adds tags, correspondents and document types to your documents. It supports PDF documents, images, plain text files, and Office documents (Word, Excel, Powerpoint, and LibreOffice equivalents). 

Paperless-ng - A supercharged version of paperless: scan, index and archive all your physical documents

Documize Community is an open source modern, lightweight alternative to Confluence. It is built for technical and non-technical users, Designed to unify both customer-facing and internal documentation. It supports Organization through labels, spaces and categories. 

Documize Community - Modern Confluence alternative designed for internal & external docs, built with Golang + EmberJS

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