3D printer
In every Star Trek TV series and movie, we have seen a replicator. It helped the crew get food in seconds and also replicate important ship parts for repairs. Today, maybe we can’t replicate food yet, but we have a 3D printer that is used to create parts for machines, as well as human organs.
Actually, one of the X-prize challenges:
https://en.wikipedia.org/wiki/Tricorder_X_Prize
#9 thats not the only thing about that movie that already exists
stun gun