Hi. Years ago I wrote a little javascript to teach my empty tiddlywiki.html download data from googlespreadsheet by id and work like a little on-line store with cart and on-line paying by cards. So people can make copy of my googlespeadsheet template put their data to it and "open" their stores on my (or their) site.
Many people collect something (coins, stamps...) and Tiddllywiki with its macros and filters can become a good instrument to make digital collection with sorting by year, material, country and so on. You can make your collection on-line, or send solo html by e-mail. Tiddlywiki has strong sides, and we can use it.