concept ships: Concept Jet fighter by Prog Wang
concept ships: Feng Zhu ships
by Ryan Church from Star Wars III
Drone concept by JoseArias on DeviantArt
ISA Sentry Drone - Characters & Art - Killzone: Shadow Fall
Can't really tell if this is a floating Drone, or supposed to be a manned craft. The name doesn't really help any because it looks more like a flying camera robot than a boat, even a space boat.
Chimeran Attack Drone by dee-virus.deviantart.com on @deviantART
Gadget-Bot by Falarsimons on DeviantArt