It is true that it's difficult to keep up with all the applications out there, so I've compiled a great list of the top 5 open source tools for libraries.
There was a time when working in the library I found it very frustrating (as many librarians do) that there were so few options for software that actually did what I needed. In libraries we're so used to there being this vendor=software model. Where one vendor controls a product and while there might be other similar products, they too are controlled by a vendor.
Via Elizabeth E Charles