This web service allows you to automate processes between different web services be allowing you to create a "recipe." For example, when I collaborate with teachers via Google Calendar, I also want the collaboration marked on a spreadsheet in Google Drive. I use an IFTTT recipe that copies any Google Calendar event containing the word "#Coaching" anywhere in the title to a specific Google spreadsheet by adding a new row in the spreadsheet for each calendar event.
I love this tool. It allows me to store my articles online, highlight, draw or write right on it, share with others. Allows for easy sign in with google, great for my students' research and close reading online skills.
"Free PDF editor, online in your browser, desktop or mobile. Edit & share PDFs for free, send faxes from the browser - even on iPhone or iPad. No software, no commitment, & no strings attached."
I would create a lesson to 1. review copyright 2. show students how to find and properly cite resources for their class projects. CC is just one of many sites students can use to find resources for their work.
This can be used in conjunction with a ELA class when studying a classic novel. If a teacher need multiple copies of a book students could access copies via the Gutenberg site - allowing them to have access on any device they choose.