It is called ‘word counter’. Simply cut and paste your writing to see if you are overusing any words. If so, grab that thesaurus and vary your lingo!
Looking to learn some useful techniques on how to manage your time? How about some tips on research? Or maybe you need some help with reading and writing?
Whatever it is you are looking to improve, you can find it at the following site. It really is a great collection that addresses many approaches to learning.
Check it out, and let me know if you find any part of the site particularly helpful in the comments below.