KohaCon2016 discusses using free and open source software (FOSS) in libraries. It notes that FOSS involves tremendous community effort and expertise over many years, providing a sustainable development model well-suited for knowledge organizations like libraries. It outlines the Koha software ecosystem and legal freedoms of FOSS licensing. Developing an effective FOSS strategy involves defining roles, releasing code openly, linking with university departments, and developing policies and procedures to support a sustainable FOSS community. FOSS should be seen not just as cost reduction but as a way to develop expertise, link to research, and support open science and data policies.