ZLib is a free Android application designed to assist librarians in managing their libraries. Developed by Pyramid Software and Consulting, the app offers a range of features to help librarians keep track of their library's resources. ZLib comes with a user-friendly interface that makes it easy to use and navigate.

One of the most useful features of ZLib is the ability to send private messages to library staff. This feature facilitates communication between staff members and helps keep everyone up-to-date on important library matters. Additionally, the app allows librarians to create personal work schedules and look up information about library patrons. ZLib also comes with a QR code reader that can be used to quickly access library resources.

Other features of ZLib include the ability to look up books by barcode, search for documents in the library repository, check out books to patrons, and manage personal information. The app also includes an inventory liquidation feature that makes it easy to manage library resources. Overall, ZLib is an excellent free app that is worth checking out if you're a librarian looking for an easy-to-use library management tool.