What about Mermaid? https://mermaid.js.org/syntax/gantt.html

It supports Gantt charts and has a pretty nice language for modifying chart content once you get used to it.

I use Obsidian with the Mermaid plugin for offline work, but there are tons of good web-based options out there, too.

PlantUML supports Gantt charts if I remember correctly. Can run locally (java if I'm not mistaken) or via web.

Why a gantt chart for a road trip though. There are not that many parallel things you usually do, no?

https://www.ganttproject.biz This one is nice

I used planner recently https://wiki.gnome.org/action/show/Apps/Planner?action=show&redirect=Planner

I also searched a lot z and didn't find good options. It works, but I don't like the way it looked.

I don't know any specific desktop applications, but you could try libre office calc :D

Planner does Gantt charts, graphical ui.

I used OpenProject before. Mainly for easy collaboration through the web though, I don't think it offers a native version.

You could use ProjectLibre although it might be overkill

vikunja

calligra plan has this iirc

Due to the nature if those charts, they're usually web based, not desktop native, and will probably have to be self hosted, even just locally. For example, Redmine supports Gantt charts and can be spun up fairly easily from its Docker image.