Companies that currently manufacture aircraft with center stick controls?
Some of the lancair airplanes have it but those are kit built so Im not sure if you can count them as true production planes. 


Vans aircraft 
Most Variants of the Piper Cub like planes that are still made 
Extra Aircraft
Pipistril Aircraft
Czech Sport (formally Piper Sport)  


Its worth noting that Cessna did recently have a run trying to make the "Sky Catcher" which was quickly discontinued but center stick none the less. 

A lot of light sport airplane and aerobatic planes tend to have center sticks.