Aiditorial Article Rewriter is the best article rewriter tool. Aiditorial Article Rewriter provides alot of options to customize the software.
Chimp Rewriter has a comprehensive user guide explaining all features of Chimp Rewriter in great detail using examples and screenshots to reduce the learning curve.
Here is quick youtube video on how to rewrite an article:
https://www.youtube.com/watch?v=keg_-j2eJ5Q&list=PLin1Fl2-Uu24cekDVq8ui-H5Oql7ea6ZZ&index=5
The manual can be downloaded from http://chimprewriter.com/support/chimp-rewriter-manual/. The latest manual is also added to your desktop when you install Chimp Rewriter.
ChimpRewriter - Best Article Rewriter - helps rewrite your article in seconds. ChimpRewriter Article Rewriter checks for duplicate after you rewrite.