Classroom Organizer is a FREE online program that allows you to enter the ISBN of books and store them for an online catalog of all of your classroom library books. There is even a free app you can download to your smartphone to scan the ISBNs for quicker entry.
Once you've put in all your books, you can add your students. Then they simply enter their information into Classroom Organizer and the name of the book they are checking in or out.
There are even videos and PDFs to help you get started. You can find those here.
And now Classroom Organizer has added School Portal for bookrooms so that teachers can check out sets of books and even share their classroom library books within the school if they choose.
So if you or your teachers are looking for a way to organize classroom libraries, check out Classroom Organizer. It might just be what you need.