The document discusses the benefits of open source systems and networks for libraries. Open source software allows freedom to use, modify, and distribute software, with communities collaborating to create programs. Open source networks could help libraries reduce costs, customize software, and share resources. Some examples of existing library open source networks and applications are provided. Developing open source networks allows libraries to assemble teams with diverse skills and ensures systems continue evolving with community support. The document encourages libraries to both use and contribute to open source software and networks.