A very thorough webpage that deals with student plagiarism is available through the Guide to Online SchoolsThe Ultimate Plagiarism Resource: Detecting Plagiarism and Preventing It”.
Looking at topics such as:
this site is definitely worth a visit, particularly for the work on ‘tips for discouraging plagiarism’.

Paper Rater

is a free service designed to help high school and college students improve their writing. Paper Rater does basic spelling and grammar checks, but the real value of Paper Rater is that it tells students if their papers have elements of plagiarism. Paper Rater scans students' papers then gives students an estimate of the likelihood that someone might think that their papers were plagiarized. Some of the other useful features of Paper Rater are style indicators, word choice evaluators, and a vocabulary sophistication indicator.

Registration is not required in order to use Paper Rater. To have a paper rated all you have to do is paste text into the "analyze" field and click "get report." I gave Paper Rater a try this evening and found it to be very quick in processing roughly three pages of text.

The Ultimate Plagiarism Resource

is a comprehensive resource detailing everything you need to know about plagiarism from the basic facts to free detection tools.…..
Topics covered include:
  • definition
  • tutorials
  • policy examples
  • classroom tips
  • online courses tips
  • free detection tools…..
A very useful resource as well as the content from these previous posts on plagiarism: