List Modules in Craft System Report
This isn't something that is built-in, probably the cleanest way would be to write a plugin that adds a Utility that lists your installed modules.

You can see all of the installed modules via:

Craft::$app-&gt;modules


...but keep in mind that this will include all of your plugins as well, since they are modules, too. You can exclude them by doing something like:

foreach (Craft::$app-&gt;modules as $module) {
    if (!is_a($module, Plugin::class)) {
    // This is some kind of module that isn't a plugin
    }
}


Note that this will include other things like the yii\debug\Module and even craft\web\Application too.

If you want to see just the loaded modules for the current request, you can do:

Craft::$app-&gt;loadedModules


(not all modules may be loaded for each request)