Zeus gets its own built-in editor and the same two mod sources
Following the pattern set for Emperor: Zeus's Adventure Editor - launched straight from the game's start screen, no separate install - joins Tools & Mods, alongside HeavenGames' misc-downloads listing and Zeus's Nexus Mods page. This time Nexus turned up nothing new; its one upload is the resolution customiser already listed.
Zeus's editor turns out to be even more integrated than Emperor's Campaign Creator: there's no separate PDF or installed utility, just an "Adventure Editor" option on the game's own start screen. HeavenGames' Scenario Design page - written by bobT, the same primer author credited on Emperor's page - is the closest thing to an official guide and is what the entry links to, since there's no repo, website or play build to point at instead.
Checking Zeus's Nexus Mods page the same way Emperor's was checked found exactly one upload: the resolution customiser, already on this page under its own entry. No second mod this time, so nothing new to add there - a useful contrast with Emperor, where the same check turned up a translation worth its own row.