Catalog of federated wiki sites with domain names for page titles and brief descriptions tuned for search.
We publish federated wiki software as a Node.js package ready to run on a variety of platforms. This is usefully run on a personal laptop or an industrial server in the cloud. Most people get started by joining a community and launching sites and/or servers with their help. The server software supports a multi-tenant "farm" option useful for small groups or heavy users. npm 
A community of open-source developers maintain both the client-side and server-side applications most frequently used to browse and edit pages. Pages themselves are composed of paragraph-sized items of various kinds. This same community provides a core set of plugins for rich content pages and a variety of experimental plugins that push boundaries of web computing. github
Ward Cunningham started the federation in 2011 with a workshop project called Smallest Federated Wiki or simply SFW. The data visualization and sharing mechanisms were supported by Nike's Sustainable Business and Innovation group. Early history has been documented in a series of video screencasts. Search for "video".