

Revelation Space series does not have FTL, but in its place, an engine that can produce 1G indefinitely (not manufactured anymore, powered by handwavium, it seems… but the secret is revealed in one of the short stories). There is further shenanigans with physics, but never FTL.
It definitely adds more nuance to the world, because now you can’t have interstellar empires if you cannot communicate over large distances.
Xed editor comes close in terms of handling files-as-files, but I found it more cumbersome and buggy than Markor.