I make a lot of custom Photoshop brushes for mapmaking and I thought others might find them useful. These are the ones I use most often. Dropbox link for download is in
Swirly Terrain Particles Photoshop Brushes, in - Envato Elements
Brush Mask Filters | Package Manager UI website
Trees Brushes | Free Photoshop Brushes at Brusheezy!
Topographic Map Photoshop Brushes by themefire | GraphicRiver
Brush Pack Vol.3 - Brushes for ZBrush - YouTube
Landscape Brushes in Unreal Engine | Unreal Engine 5.0 Documentation
Quick Look at Photoshop 3D Tools for Terrain - YouTube
Unity - Manual: Brushes
Broken Edges Texture Brushes | Free Photoshop Brushes at Brusheezy!