Free online tools
Mathematics
Tools for common mathematical tasks
Colors
Color picker, tools for modifying or generating colors
Text and lists
Work with lists and texts, sort, randomize, reverse
Numbers
Work with numbers, generate, filter, sort
Date and time
Measure time, calculate distance between dates, chronometers
Images
Resize images, crop, optimize and more
Randomness
Generate random numbers, randomize lists, common distributions
Files
Convert, compress, join or split
Programming
Tools for programming and web development