Following the post about Prezi, and by implementing the tools used by me give you an example of a useful tool for day-to-day any educator: a scanner plagiarism named: Approbo.
This tool (in Spanish) provides, even without registration, review documents and identify similarities between what exists outside of this network.
As becomes clear, after use, the algorithms of the program identify similarities word by word so you must verify the results after the match.
In this example of a paper written by my team, identified the exact quote used (the part that is more shaded).
It remains a very important tool, and despite the interface being in Spanish, he identifies texts in any language, simply upload the document (so far experienced in doc, odf and pdf),
and wait for the matches, or not, as is the case: