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Sumo
frankenbike
Someone's gonna crack it or come up with an open source alternative any day. Shimano and SRAM are going to cry when people get crappy old derailleurs working with 12+ speed for £50.
the simpleton's version would be this:
https://www.youtube.com/watch?v=RYgaulRbll0
tell it what derailleur you've got (whereupon it looks up pull ratio in a database) and what speed cassette (whereupon it sets the sprocket pitch). Just like a Rohbox.
or:
https://www.youtube.com/watch?v=MEMDepeSEUA
https://www.youtube.com/watch?v=ThED8L_tjb8