Well, openERP or openbravo were what I would have recommended ten years ago, but due to their commercialization aren’t really relevant any longer. If I personally was setting this up for myself I would probably use redmine and a plugin that gives redmine the invoice functionality. However I wouldn’t call it simple for a first timer to pull off, but if redmine is mastered you will find very extensible and customizable to any particular project’s needs.
I completely agree with every word, it was the observations alone of dark energy and matter that led me in this direction.
At one time I tried to describe them with an unknown fifth dimension, but later realized that’s only an abstraction. Perhaps just maybe black holes and universes share this property of evaporation, which if so, would have interesting consequences.
I have the thought experiment to go along with the paper, if you’d like to see that at https://madhakker.com/ just scroll down one post. That was from when I was trying the fifth dimension angle, but it does a good job of describing a dark matter like signal in the terms of a changing mass.
I second the roku, they are economically priced, they perform very well, minimal ads. My friends and family use them to stream from my jellyfin server over the internet to their homes.