Word Square - Sudoku, but with letters and words.
Who Can Use - WhoCanUse is a tool that brings attention and understanding to how color contrast can affect different people with visual impairments.
SudoKoi - Your next favorite pastime, like Sudoku
Cron Color - Free web tool for designing color palettes and checking contrasts.
UsDoku - Play real-time multiplayer Sudoku.
Kontrast - Check and adjust web element contrast in real time.