The software application published by Keysight that includes the feature/module/file named `b_cct_layout_momentum` is **Keysight's Advanced Design System (ADS)**.
The `b_cct_layout_momentum` is related to the Momentum 3D planar electromagnetic (EM) simulator, which is a part of the ADS environment. This module typically deals with the layout and simulation of circuit structures in a 3D space, allowing for detailed analysis of microwave and RF