TeamLab is a free open-source platform for business collaboration and project management. It allows you to use social networking tools such as blogs and forums, organize business tasks and milestones, as well as communicate with your team members via corporate IM.
Cloudera offers enterprises a powerful new data platform built on the popular Apache Hadoop open-source software package.
Salesforce Chatter aims to transform the way you collaborate with people in your company. As both a collaboration application and a platform for building social cloud-computing apps, Chatter helps you connect and share information securely like never before - all in real time.
Yammer is a tool for making companies and organizations more productive through the exchange of short frequent answers to one simple question: ΓÇ£What are you working on?ΓÇ¥ As employees answer that question, a feed is created in one central location enabling co-workers to discuss ideas, post news, ask questions, and share links and other information