Intuitionistic Zermelo-Fraenkel Set Theory in Coq. This development contains the set-as-pointed-graph interpretation of Intuitionistic Zermelo Frankel set theory in system F_omega.2++ (F_omega + one extra universe + intuitionistic choice operator), which is described in chapter 9 of the author's PhD thesis (for IZ) and in the author's CSL'03 paper (for the extension IZ -> IZF).
opam install coq-izf.8.8.0