PubPub is a free open source publishing website. Its aim is to facilitate the creation and publishing of knowledge. It is an open-source, hosted, free-to-use content management system designed to help knowledge communities of all types collaboratively create and share knowledge online. PubPub’s flexible, extensible system allows communities to create the dynamic content that best represents their work, whether it’s a traditional academic journal, a book, a repository of interactive documents, a blog, all of the above, or something in between. If needed, PubPub then helps communities integrate their work into academic infrastructure like Crossref and Google Scholar without the need to remake it to conform to legacy expectations of how academic outputs are structured.