Substance Painter 2.3 Adobe Photoshop Export
Take a look at how to export a Substance Painter project to a Photoshop PSD file using the new PSD Export plugin that ships with 2.3.
Perspective Tools v2
Create perspective and parallel grids and more with Perspective Tools for Photoshop.
Free Photoshop Brushes
Several professional artists have made available their Photoshop brushes for free.