Floppy is a multi-purpose plugin for reading and writing values to the browser's storage, using the localStorage,  sessionStorage, or IndexedDB interfaces. Unlike other storage plugins, Floppy supports nearly any Bubble data type including Things, Lists, and lists of Things.
It also has built-in scalar (single value) and list (array) states that are similar to custom states, but with a more robust set of manipulation features. These can be used to construct, modify, and manipulate lists. Additionally, there is support for drag and drop manipulation of items inside and even across repeating groups (works in both "old" and "new" responsive engines).

Floppy includes a wide variety of List manipulation features, including Actions to help you easily build, modify, and process Lists. Extra utility Actions include a proper "count" function for lists with list fields and "List Math" for doing simple mathematical operations on numeric lists. All of the List Shifter "SHIFT" functions you know and love (like Move, Reverse, Rotate and Swap) are implemented with enhanced error checking for goof-proof operation by newb- and pro-Bubblers alike.

New features include the ability to easily change individual List items, add items (and even lists of items) at arbitrary locations in a List. Lists can be processed List Shifter style (allowing duplicates) or Bubble style (prohibiting duplicates).

BUT WAIT... THERE'S MORE!

The Floppy plugin collection is now the home of List Shifter (dubbed List Shifter Pro now).

Floppy also introduces two additional, all-new approaches to iterating over Lists: Step Mode (which lets you iterate over a List with more flexibility and control than in List Shifter) and the "Code: Array Method", which lets you write simple (or even very complex) JavaScript to process lists using operations like .map() and .filter(), faster and more easily than with other solutions.

In addition to the main Floppy element, there's a simplified Floppy Reader element for reading/writing multiple values of different scalar and List types from/to localStorage, sessionStorage, or IndexedDB.

New enhancements are planned over time to (for example) provide some of the same List processing features on the server side (as Server Side Actions). Floppy's List Math, Make Numeric List and Count Each Field/Sort actions are all available as SSAs.

Additional utility plugins include:

Floppy Expression Watcher: Evaluates and monitors the results of any list and/or scalar expression for changes, triggering an event when that happens (it optionally publishes the expression values).

Floppy Hacker: A utility element that exposes various internal Bubble states and functions.

Floppy Rehydrator: Takes lists of Bubble thing unique IDs and converts them back into the Things they represent.

Floppy Date Range Processor: Make a list of Date Ranges unique and/or sort that list properly.

Experimental/work-in-progress elements including REANIMATOR (my implementation of anime.js) and an Inline SVG element.

Try Floppy in monthly subscribe mode and then purchase it permanently for your app. For apps on free plans, direct message @keith in the Bubble forum to purchase directly. If you're interested in licensing Floppy for multiple apps at better rates, you can also inquire via direct message in the Bubble forum.