Documents

PikiWiki

From the site:

- create and layout a web page with any content, using the web browser. No downloads.

- share your new web page and let others add their own content to it.

- form groups with other users to privately collect and collaborate on your web pages.

Scribd

From the site:

Scribd is a free, web-based, document sharing community and self-publishing platform that enables anyone to easily publish, distribute, share, and discover documents of all kinds. E-books, presentations, essays, academic papers, newsletters, photo albums, school work, and sheet music are just a few of the different kinds of documents you can publish and share on Scribd.

Gogrok for Skype

From the site:

The best way to work with your co-workers online. 

Sometimes voice is just not enough. Imagine if you were to explain the usage of a software application, how do you find explaining that through IM text chat or Skype voice? What if you and your friends/co-workers all want to edit the same file or use the same software application? Gogrok can fill the gap. 

You may share your software/file/desktop with other Gogrok users as long as they are online. It's very easy to use. 

Gogrok works hand in hand with Skype. You may discuss with your friends/co-workers using Skype voice. If you have to show and share something to help understand each other better, launch Gogrok along with Skype to enhance the communication.

Yugma - Skype Edition

From the site:

Skype revolutionized real-time communication online. Now, Yugma revolutionizes real-time collaboration by enabling quick and instant sharing of ideas by letting you conduct virtual meetings or share desktops spontaneously. Yugma works across platforms - working seamlessly between Windows, Mac and Linux, and is easy to use. Yugma lets you connect with up to 10 other people for free.

Mochila

From the site:

"Mochila is an online content marketplace for publishers, editors, creators and advertisers. Designed to be first to market, Mochila leverages the power of the Internet to facilitate the acquisition and sale of high quality content that includes articles, photography and soon video and audio."

Pages