Debuggex

visual regular expression debugger, tester, and helper

i want hue

Tool to generate and refine palettes of optimally distinct colors.

JavaScript variable name validator

Checks if a string is a valid JavaScript variable name.

microjs

find the JavaScript micro framework(s) you need

Photopea

very good online image editor

Rubular

a Ruby regular expression editor

Shapecatcher

Allows you to draw a shape, and tries to find similar Unicode characters.

Snippi

Share & annotate text

Sprite Cow

generates CSS for sprite sheets

SymbolHound

search engine that doesn't ignore special characters