FOSS Wiki is a community-edited reference for free and open-source software (FOSS) and Linux-related topics. It aims to make information accessible to users of all experience levels through clear overviews, practical guides, and connections between concepts, distributions, and tools. The wiki complements existing documentation rather than replacing it, and highlights useful references and best practices across the wider ecosystem.

Its topics include desktop environments, Linux distributions, software, package managers, operating systems, programming languages, Wayland compositors, X window managers, terminology, and mascots. The site also offers guides and policies to help readers understand the subject matter and contributors follow consistent standards.

FOSS Wiki invites users to improve its content by editing articles, adding material, uploading freely licensed images, checking citations, and refining prose. Contribution guidance, wiki guidelines, a code of conduct, and editing help support new and experienced editors. The project emphasizes accuracy, courtesy, impartiality, and accessibility. Community support and project updates are available through its Discord server, while administrators can be contacted through the listed channels.