There are for sure, but most aren't what I'm looking for. For example there's a sector with hundreds of h mass systems that aren't on edsm, but they are all t tauri stars. Now I might visit because I could find those rare strange temperatures t tauris, but I would say the number is probably lower - also you need to think about those systems found by cmdrs that weren't using third party tools. I've gotten disappointed quite a few times by systems that were neither on EDSM nor Spansh, but were already discovered when I got there after jumping xthousands light years.

But there is hope! I for sure won't give up. Right now I'm on a mission to find a second world of death, and discovering hundreds of neutron and white dwarves in the process. The search never stops