I searched through the many list things out there, and none of them gave me the flexibility I wanted. This is something I wrote for myself, and I decided to make it something everyone can use.

Most other list apps are one-dimensional. You have a shopping list and a to-do list. This is a tree that lets you make lists of lists of lists. You can put your entire life into your Simplist and it won't be overwhelming or difficult to manage. My Simplist is seven layers deep in some places, which I didn't even realize until I counted.