Version 1.27 adds Charm support for units, and significantly enhances the power of tech/unit filter queries. See the details in the thread and the updated Help documentation for the filters.
Note that this is a Java 8 build; if you already have Java 11, you will want to either stay with 1.26 Mac in the interim, or "Windows XP-ize" this new version.
Cross-Platform Civ3 Editor 1.30
A custom Civ3 scenario editor that expands on the possibilities of the original