Normally the modules we download from marketplace comes under App – Marketplace Modules. But if they are widgets, they won’t be visible there, but can be found in widgets folder in App Directory.
And you don’t have to import modules on each machines, when we commit the code and others take update it will be available for everyone.
As per my knowledge, all the AppStore modules are listed under App > Marketplace modules > Listed here.
If you download and commit your code it will be available for others as well who are working with you.
If you still have question may be you can post a screenshot.
Modules from the app store can be found in your project explorer “Project → App Store Modules”. These modules are also uploaded to the team server so they will be available for team members if they update.
So it may well be that everything I downloaded was a widget. In which case they will not be under marketplace modules?
I don’t appear to have a widgets foilder at the top of the folder structure. There is a widgets under Atlas_Core.