The extra packman exists which allows you to pack a selection of templates, TVs, chunks, snippets and plugins into a single ZIP package. You can then just drag this ZIP into your package manager to install all of the components.
The version currently in the extras downloader does not work with MODX 3 - however - @halftrainedharry created an alpha version which works well. You can download it here.
Just drag that ZIP file into your site’s package manager and install it.
You can read a bit more on this here.
Hopefully this extra will be updated soon.