https://phpcodechecker.com/ - PHP syntax analysis - find missing or extra code ( e.g. "1 extra curly brace found" )
https://htmlcolors.com/color-converter - Web Color to RGB, Hex etc.
https://htmlcolors.com/rgb-to-hex - RGB to Web Color
https://www.htmlstrip.com/unminify-css - Un-Minifiy CSS code
https://developer.mozilla.org/en-US/docs/web/css/gradient/linear-gradient - Linear-Gradients (CSS)
https://www.designcise.com/web/tutorial/how-to-apply-cover-or-contain-to-an-image-element-using-css - Scale images
Kirk's Apps - Useful applications
Autons/Portable Code options identified with {*}