Free Materials

I occasionally peruse through Reddit's teacher board and recently came across a posting advertising free Common Core aligned materials.  Since I rarely object to anything that is free, I clicked on the link to the Print Worksheets Free site.  This site offers an extensive library of materials for math, reading, writing, grammar and vocabulary.  It also offers classroom management tips as well as links to educational articles.   I appreciate people who create sites such as this as a service to the profession and have already bookmarked it for future and frequent use.