I had someone in one of my streams who'd found an odyssey just floating in hyperspace and was able to reactivate it.
Otherwise, my finds include a Sunder in the belts near chicomoztoc (brilliant early game start, especially if you get ion beams. Just look at a domain drone and it dies), a colossus floating in hyperspace, numerous class V and IV worlds, a research station, both types of [REDACTED] station, a mothership and a healthy respect for flies smashed into windscreens when those "friendly" prospectors turn out to be not so friendly.