Material Maker - Cross-platform, procedural texture generation tool.
Material Palette - Generate and export your Material Design color palette
Substance Designer - Substance Designer is a node-based non-destructive application for material authoring.
Color Hunt - Curated collection of beautiful colors, updated daily
TextureLab - Free, Cross-Platform, GPU-Accelerated Procedural Texture Generator.
Coolors.co - The super fast color schemes generator! Create, save and share perfect palettes in seconds!