JOSM Plugin to visualize routes
This plugin adds tabs to the relation editor that make editing routes easier.
It allows opening a GTFS file as separate layer
You need to have Java installed and I recommend Linux (but it works on Windows, too).
To run the current development version of the plugin, clone the project locally and then run: ./gradlew runBoot
Start IntelliJ (Community Edition or Ultimate)
It will allow you to check out a Project using Git. If you don't find this option, use Git → Clone in the main menu.
You can use this URL:
https://github.com/michaelzangl/josm-visualize-routes.git
After IntelliJ has started, you can press Ctrl twice, it will open a run prompt. Search for runJosm and run that task.