3 ms·There are many (20+ main ones), and they're all horrid dinosaurs.by bensummers 17y agoThere are many (20+ main ones), and they're all horrid dinosaurs.patio11 17y agoDo not insult the dinosaurs by comparing them to library management software.eru 17y agoOPAC seems to be quite common in Germany. It works reasonably well (from a library user's point of view).