Tricorders: The Wikipedia article has quite a list of "real tricorders" developed so far.
Replicators: Stereolithography and selective laser sintering have created a market in fast prototyping (creating physical objects from 3D computer image files) and have undergone a lot of development already. NASA will be testing a new type on the ISS that doesn't require gravity. I have a Panasonic bread machine, which can make various bakery products. The first one hit the market before TNG first aired.
LCARS: I have interactive LCARS displays in my house. So do lots of people.