D3 4.0 is being developed under the (new?) D3 Github organization at https://github.com/d3 https://github.com/d3 and with a new "everything in D3 is a plugin" a

D3 4.0 is being developed under the (new?) D3 Github organization at https://github.com/d3 https://github.com/d3 and with a new "everything in D3 is a plugin" architecture, making it easier to extend D3 and easier to import parts of D3 piecemeal into other projects.