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Daemons are programs that run as a background process. These programs may or may not have a long life cycle and exist in a paradigm different to tweaks. They do not require to be injected onto other processes, that means that they exist by themselves.

How to make a daemon

There's two steps: making a program and making a plist for it.

The program

While idle, the program should waste the least possible resources. Remember that it is working along with many other already existing processes.

Given that memory isn't shared across processes, one cannot call functions or get objects freely between processes. To solve this, one must use some form of IPC (notifications, XPC, sockets) to communicate with the daemon.

The plist

Place your plist, following the reverse DNS notation (com.your.daemon), in layout/Library/LaunchDaemons.

To do: table specifying the keys and values.