Utilities

Color

• Color Picker: Quick color reference and RGB/HEX converter.
• Mac Digital Color Meter: Mac application to find values for any onscreen color.
• Windows Color Picker utility: Windows application to find values for any onscreen color.

Images

• Lorem Picsum: Source for hosted stock images (primarily for use with CodePen).
• Squoosh: Image resizing, cropping, and compression.
• Unsplash: Source to download free high-quality stock images.

CSS Generators

Tools that help generate complicated CSS code to achieve a specific look.

• Box Shadow
• Gradient
• Slider
• More at CSS Portal

Miscellaneous

• AudioMass: Simple audio editing and conversion.