This is a pack of internal stages in x2m format.
Pack of Internal stages: (this is technically a mod not a tool, but I'm putting it here). Source code: (updated for game version 1.16) the combined source code of xv2patcher, XV2 Mods Installer, genser, Cycit, Cac2X2m/X2m2Cac, XV2 Quest Importer, and the iggy projects used by xv2patcher and XV2 Mods Installer.