This document summarizes an presentation about open source software for libraries. It discusses what open source is, how it benefits libraries, and examples of open source products that libraries can use. Open source is defined as software where users have the freedom to use, distribute, study, and modify the code. It draws on a global community of developers to improve software. Libraries are a natural fit for open source as they value open access to information and collaboration. Common open source software used in libraries includes integrated library systems, digital archives, and discovery tools.