Google Sites is a structured wiki- and Web page-creation tool offered by Google as part of the Google Apps suite. The goal of Google Sites is for anyone to be able to create a team-oriented site where multiple people can collaborate and share files. Google Apps can be very useful for project management to collaborate between team members or to publicly display the progress of a project.
manage
Managing here includes content management systems (CMS) that manage content for publication or distribution. Functionality usually includes the ability to create, retrieve, update and delete (CRUD).
Joomla
Categories: Design & Visualization
Joomla is a free and open-source content management system (CMS) for publishing web content. It is built on amodel–view–controller web application framework that can be used independently of the CMS.
Joomla is written in PHP, uses standard programming techniques and stores data in a MySQL, MS SQL, or PostgreSQL database, and includes features such as page caching, RSS feeds, printable versions of pages, news flashes,blogs, polls, search, and support for language internationalization. Joomla supports over 60 languages.
As of February 2014, Joomla has been downloaded over 50 million times. Over 7,700 free and commercial extensions are available from the official Joomla! Extension Directory, and more are available from other sources. It is estimated to be the second most used content management system on the Internet after WordPress.
Omeka
Categories: Design & Visualization
Omeka is a free, flexible, and open source web-publishing platform for the display of library, museum, archives, and scholarly collections and exhibitions. Its “five-minute setup” makes launching an online exhibition as easy as launching a blog.
Omeka is a Swahili word meaning to display or lay out wares; to speak out; to spread out; to unpack.
Omeka falls at a crossroads of Web Content Management, Collections Management, and Archival Digital Collections Systems: 
Omeka is designed with non-IT specialists in mind, allowing users to focus on content and interpretation rather than programming. It brings Web 2.0 technologies and approaches to academic and cultural websites to foster user interaction and participation. It makes top-shelf design easy with a simple and flexible templating system. Its robust open-source developer and user communities underwrite Omeka’s stability and sustainability.