These actions basically just create a list. I always found it a bit annoying that PlayMaker could not store lists of data without a external plugin. (Or it can and i dont know how).
You can store items in your list and get the value out of the list by index. It is pretty simple. ArrayMaker already does this I assume. I personally found ArrayMaker a bit clunky if I only wanted to store some values.
This is more for my personal use, but if others find it useful they can use it.
6 Simple small actions
Create list
Add To List
Clear List
Get List Item
Get List Size
Remove From List