Thanks to many great contributors, we are proud to present the Graphs... because wiki pages with SVG and PNG images is so last century. Graph extension allows content authors to insert a data-defined graph or a map in a wiki page. Graph is described using Vega visualization grammar ( demo), and allows very complex data transformations, filtering, and soon even animation & interactivity. Combine that with the power of wiki template parameters and Lua scripting, and the results could be stellar. Up to you really. Vega+d3 gives us a huge list of charting options and maps with numerous projections and ability to highlight individual regions. Lastly, graphs could be rendered either in a browser (more interactivity), or on the server (faster load). Demo will be served.
Special thanks goes to milimetric, krinkle, Brion, and gwicke, without whose help this project would have been a lot harder, and to Vega and other open source teams who build such great libraries.