E-learning tools for group work: Collaborative creation of documents

Google Drive is a file storage and synchronization service provided by Google consisting of collaborative text-editing, spreadsheet and presentation tools (http://www.google.com/intl/es/drive/about.html).
Wikis are collaborative websites which allow users to add, modify or delete content via a web browser. The most common example of a wiki is Wikipedia, also an unmatched example of collaboration. Some examples of wiki tools are:
- Pbworks (http://pbworks.com)
- Mediawiki (http://www.mediawiki.org/wiki/MediaWiki)