Let's talk about
The Future because NES tends to have really terrible future settings and could do with some inspiration and pointers in that regard! I recommend perusing some of the following, which due to the speculative nature of
The Future are often RPGs, and almost all of which are far-future space-opera pew-pew lasers and nanomachines, son! stuff:
Eclipse Phase - The core rulebook is available under Resources. It borrows a
lot from Richard K. Morgan's sci-fi, but is a fairly nicely put together resource.
Transhuman Space - You'll have to look around for it, it's a bit outdated and sort of laughable in some areas, but again, it's decently well put together.
High Frontier - An interesting mechanically-driven boardgame about the colonization of the Solar System,
High Frontier nonetheless gives it a pseudo-realistic look while still being transparently a game.
Orion's Arm Sprawling, sort of open-development, poorly organized, and often featuring terrible graphics,
Orion's Arm nonetheless has some neat ideas here and there.
Physics of the Future: How Science Will Shape Human Destiny and Our Daily Lives by the Year 2100 - Michio Kaku's latest book, it sometimes goes off the rails occasionally when he veers away from technology, but on technology it's fairly grounded if often vague.
Atomic Rockets - There is no better resource for future space technology, although it's all mostly focused on business-end stuff.