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Elgg is an award-winning open source social networking engine that provides a robust framework on which to build all kinds of social environments, from a campus wide social network for your university, school or college or an internal collaborative platform for your organization through to a brand-building communications tool for your company and its clients. Elgg was voted best open source social networking platform in 2008.

Open Source Social Networking & Social Publishing Platform.

http://www.elgg.org/about.php

dotproject - Open Source Software :: Open Source Project and Tas

dotProject is a volunteer supported Project Management application. There is no "company" behind this project, it is managed, maintained, developed and supported by a volunteer group and by the users themselves. If you would like to download the package use the downloads link on the top right. http://www.dotproject.net/
http://www.eucalyptus.com/ Eucalyptus is the world's most widely deployed cloud computing software platform for on-premise (private) Infrastructure as a Service clouds. It uses existing infrastructure to create scalable and secure AWS-compatible cloud resources for compute, network and storage.

Eucalyptus | Your environment. Our industry leading cloud comput

http://code.google.com/intl/it-IT/webtoolkit/

Web Toolkit - Google Code

Google Web Toolkit (GWT) is a development toolkit for building and optimizing complex browser-based applications.