How to create new Brushes to Toolbar with the Builtin_Brushes but with custom settings/different brush data? - Blender Development - Developer Forum
Blender Market - A great collection of custom stylized brushes to use in Blender. Alphas are included to use in other softwares. More than 550 brushes ready to use inside Blender, image
Making Custom Brushes in Blender - YouTube
Texture Painting with Custom Brushes — Blender Secrets
Georg's Procreate Brushes - Blender & Paint Brushes Demo Video Here are a few...