You just can’t beat FLOSS for flexibility, performance and price. FLOSS licences allow users to run, examine, modify and distribute the code. What else could you do with it? Nothing. It just works for users. Because their are no secrets about FLOSS the performance is as good as anyone wants. Otherwise they would improve it further. The price? $0, usually, plus a little installation and maintenance. It’s all gravy.
“Oslo Library’s Digital Services team explains on its website that it selected KOHA after having considered purchasing proprietary alternatives and developing one of their own. Decision criteria included the possibility to adapt the system to future needs, the potential for integrating it with other systems and the costs involved in procurement and operations.”
The same choices could be made for any FLOSS, from the GNU/Linux OS to desktop and server applications. The world can and does make its own software and it’s hard to beat.