Sometimes you find a resource that makes you say “YES!” This is one of those resources.
Are you trying to improve your writing skills? Santa Barbara Community College has an absolutely phenomenal website with loads of resources to help you! PLEASE take the time to check out all they have to offer: http://www.sbcc.edu/clrc/writing_center/onlinewritinglibrary.php
I highly recommend that you pay special attention to the “RESOURCES FOR ENGLISH LANGUAGE LEARNERS” section.
This would be great for students in the upper levels of ESO, Bachillerato, university or adults in general.
I hope this resource helps you improve your writing skills!