Waveform viewer. Packaged with NCSim.
The SimVision GUI can be opened with:
ncverilog -access +rwc -gui counter_tb.v
Or to view a .shm wave file:
simvision waves.shm
-access +rwc allows you to see and alter values. Source: https://community.cadence.com/cadence_technology_forums/f/30/t/11942
TODO: what is c for? Stands for "connectivity" http://www.edaboard.com/thread23842.html
Looks like a step debugger / waveform viewer for Verilog.
There are several open videos from Cadence about it: https://www.youtube.com/watch?v=a2YmCK0uzJs&list=PLYdInKVfi0KYzCjnkgRgDXFJcKyQRz6eM