I've been thinking about this idea lately of software written for small groups of mutually-trusting humans, like families. I like to think of this type of software as "sub-Dunbar software", named after Dunbar's number:
suggested cognitive limit to the number of people with whom one can maintain stable social relationships
Sub-Dunbar software is any software that is optimized for groups of this scale and intimacy. It's cozy.
Here's some reading related to this idea:
it would not surprise me if we moved away from "public square" online dynamics to "small intimate online dinner party" online dynamics.
I didn't know it at the time, but todoMini is an example of this type of software. I wrote it for my family, not for scale, and it won't change. I hope to build more sub-Dunbar software.