This document discusses free/libre and open source software (F/LOSS) and its benefits for non-profits. It begins by defining proprietary software, which is owned and restricted by its creator, versus F/LOSS, which is licensed to allow users to study, share, and modify it. The document then outlines some of the idealistic reasons to use F/LOSS, such as democratic decision making and sustaining the cultural commons, as well as pragmatic benefits like lower costs, software tailored to needs, greater security and more frequent updates. It provides examples of useful F/LOSS tools for non-profits and concludes by advising readers to consider existing strengths and community support when deciding where to