Fi-tech (fictional technology)

Here is a extremely short list of my Fi-tech I would love to have:

1. The Brainpal, from “Old Man’s War” and “The Ghost Brigades”
2. The ansible, from the “Ender’s Game” series
3. The Erde Kaiser line of mecha from Xenosaga (who wouldn’t want one- the weakest of the line can destroy moons)
4. The Decoherence Cannon from “A Miracle of Science” (It can force black holes to collaspe)
5. The nanites from a lot of Modesitt’s book’s

Any Fi-tech that you wouldn’t mind having?