Heytools - JavaScript tools, AJAX tools and some fully server side tools.
AirMeasure - Turn your phone into a ruler with the power of AR
WordCounter.net - Count words, sentences, paragraphs etc.
FeetMeter - App to measure your feet and check your shoe size
TextBuddy for macOS - A Swiss Army knife for plain text.
MeasureKit - Whatever you want to measure, we have a tool for that.