Vvvv - vvvv is a graphical programming environment for easy prototyping and development.
Adobe Capture - Turn any photo into a color theme, Look, vector graphic, or unique brush that you can use in your creative projects with Adobe Capture.
Processing - C++ and Java programming at the speed of thought.
Gradient Hunt - Curated collection of beautiful gradients, updated daily
TouchDesigner - TouchDesigner is a visual development platform that equips you with the tools you need to create stunning realtime projects and rich user experiences.
Brand Gradients - Natural, Brand, & Color Gradients in CSS & Image Backgrounds