SMAR carries many devices with built-in PIDs and other control algorithms. These controllers are present in dedicated controllers, transmitters, PLCs, and in or modern DCS (Distributed Control System), the System-302.
However, I believe that your question is in reference to PID controller units for panel installation, with its own display and buttons interface to interact directly with the user.
For this case I should recommend you to look at the CD600Plus.
The CD600Plus is a stand-alone multi-loop controller that can resolve up to 8 PID controls.  It is block configured using an easy to learn Windows graphical interface.
See more on the CD600Plus