Oh, lots of them. And 'game changer' in which way varies too.
Like, Star Trek Replicator technology would crash and remake the galactic economy, and drastically change worlds like Tattooine.
Personal shields would really shake up infantry combat.
Higher levels robots would certainly change the situation with droids. If mass-produced person-level robots are common, rather than just the odd higher end droid that develops over a long period, you could see a major shift in a lot of things!
Hm... the technology to artificially give people force potential safely would change the galaxy.