Two directions. A machine can talk to Plexus over an SDK, or Plexus can read the system that already holds your data — a ground system like YAMCS or COSMOS, or the database you already run. Nothing is copied unless you ask for it.
Each page below says what Plexus reads, what it does not, and which version we last ran it against. The second list is the one worth reading.
A system belongs on this page if it answers three questions: are these signals over time, can it describe what it has, and can it answer a bounded historical query. Three yeses and connecting it is a small piece of work rather than a project — the connect form, the signals view and the storage all come from the same contract, so nothing new has to be designed.
If you run something that answers yes and is not listed, that is a conversation worth having — particularly if you build the ground software rather than only use it.