Juan Osborne independent developer
Re-assign the number properties, or other, of multiple elements in the order that the user selects by picking | Free
Advanced filter with expand capabilities and selection keeper | Free
Advanced way to transfer content and standards between one file and another (or multiple) | Free
Workset creator will let you handle workset names and create multiple worksets in just a few clicks. WorksetbyAverage will let you assign workset to multiple elements based in category, family or type | Free
There's more information available on the Autodesk App Store.
Editor's Note: It looks like Juan Osborne is a talented and interesting guy. Based on his website, Osborne is an artist as well as a fellow Revit geek. Based on the images above, I believe it (some add-in developers might be well advised to outsource the graphics end of things to Osborne). Here are some other examples of his BIM-related artwork. Nice!