The importance of usability activities in free open source softwaredevelopment has been acknowledged in the research literature and practice.However the decentralized and engineering-driven approach of open sourceprojects can conflict with UX methodologies. As these cultures mergedevelopers and designers may be exposed to situations where the values clash.We will review existing academic papers on UX in open source and discuss howthese two philosophies can co-exist in OSS development and how designers canbecome part of the open source community.