CSS Matic offers great CSS tools and generators for web designers and developers. CSS Box-Shadow, Border-Radius, Gradients and more.
Clippy is a tool for generating values for shape functions for the new and cool CSS clip-path property.
Maketext is the free modern cool text generator that empowers SVG filters and 800+ open-font-licensed web fonts.
Trianglify.io is a tool to generate low-poly, geometric (triangle) backgrounds, patterns, textures, and vectors, created by Quinn Rohlf.