Technology that was correctly predicted by Star Trek...
Automatic sliding doors. On the set of the original Star Trek, there were guys you didn’t see physically pulling the doors open. The Star Trek blooper reels included several shots of cast members walking into doors that didn’t open in time.
Cell phones. The prototype for the first wireless phone came out 8 years after we saw Kirk use a communicator. The flip phone was directly inspired by the communicators in the original series.
Bluetooth earpieces. The first wireless earpiece was in Uhura’s ear.
Flat screen monitors and TVs. In 1966, most TVs were giant boxes. Many were still black and white.
Voice assistants. We alert them now by saying “Alexa”, “Siri”, “Hey, Google”, etc. On the Enterprise, they just said “Computer”.
Universal translators. Although they haven’t figured out how to translate languages that we’ve never heard before. I never figured out how they did that on the show.
Tablet computers. Kirk and Uhura would occasionally write on bulky tablets. The Next Generation brought with it slimmed-down devices that more closely resembled iPads.
VR. Holograms don’t yet look as good as the those on the DS9 holodeck, but VR goggles are getting pretty good.
3D printers. That’s basically what the replicators were. At the time, replicating food seemed like a stretch to me, but now they can actually make food with 3D printers.
Tractor beams. Scientists at NYU have developed devices that can push, pull or hold matter, which they actually refer to as tractor beams, in honor of Star Trek.
Antimatter. Scientists had created antimatter when the show debuted, but it has only been about a decade since it could be captured and stored. Until then, the notion of a matter/antimatter power source was a pipe dream. It may be a long time before it happens, but that’s what I would have said about many things on this list a few years ago.
So, if that’s not enough, now this comes up...
https://www.popularmechanics.com/science/a35718463/scientists-say-physical-warp-drive-is-possible/