Thanks for the answer. These tools seem not to do what I want to do. All of them have collection as in and output. I would like to input a collection and get the separate data sets back, essentially the inverse operation of building a collection. I.e. building the collection is: dataset1, dataset2,... -> collection
I want to have the other direction.
Please see the tools in the tool group Collection Operations at https://usegalaxy.org for the currently available operations to unzip and manipulate existing collections.
More discussion about collection manipulation/dataset extraction is here (future goals): https://github.com/galaxyproject/galaxy/issues/740
Reference tutorial for creating/using collections (does not include the new manipulation operations - yet!): https://galaxyproject.org/tutorials/collections/#using-collections
Thanks! Jen, Galaxy team