Photoshop Tutorials is a well-known website for Photoshop learners.
SparkleStock produces add-ons for Photoshop, Lightroom, and other content-creation software.
Designers and artists showcase their works on Design Ideas.
Interior designers showcase their works on Interior Designio.
Denny’s Tips produces helpful Photoshop and Lightroom tutorials.
VOXCOLOR sells color grading products and researches new color science algorithms.