SubstanceBridge is part of a tool and script collection, to easy export meshes and import baked maps back to your Houdini scene.
Current state, Windows Only.
You need a proper Adobe Susbtance License and the corrosponding apps. Or some older perpetual Allegorithmic Version(s) that supports UDIMs (Substance Painter) and the Substance Automation Toolset for Substance Designer.