Cyn.in is a group collaboration software created by Cynapse, that inter-connects your people with each other and their collective knowledge, seamlessly. Cyn.in helps teams to build collaborative knowledge by sharing and discussing various forms of digital content within a secure, unified application that is accessible using a web based interface or a rich desktop client. Cyn.in combines the capabilities of collaboration tools like wikis, blogs, file repositories, micro blogs, instant discussions and other social applications into a seamless platform.

Plone is easy to use. The Plone Team includes usability experts who have made Plone easy and attractive for content managers to add, update, and maintain content.
Plone is easy to install. You can install Plone with a click-and-run installer, and have a content management system running on your computer in just a few minutes.
Plone is international. The Plone interface has been translated into over 30 languages, and tools exist for managing multilingual content.

Alfresco is the first open source enterprise-scale document management system that includes a modern content repository, an out-of-the-box portal framework for managing and using content designed to work with standard portals, and a groundbreaking Common Internet File System (CIFS) interface that provides Microsoft Windows file system compatibility. Alfresco takes the lessons of building document management systems for the last 15 years and applied them to build an open source content management system that is easier to use, more scalable and more adaptable.