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WordItOut (A Wordle editor)
WordArt ("SQ" is "free!")
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Sketch.io
Color wheel
ConvertAcolor
G'Mic Online
OIE* (Online Image Editor)
Kleki*
Vectr
Play Origami!
Streema - Radio
GeoGebra Graphs
Butterchurnviz - (Audio visualizer)
Dual N-back (from Brainscale)
Cognitive Fun!
Mastermind
Pat-or-jk's Slider puzzles