Heytools - JavaScript tools, AJAX tools and some fully server side tools.
Word Counter - A simple, beautiful word and character counter
WordCounter.net - Count words, sentences, paragraphs etc.
TextBuddy for macOS - A Swiss Army knife for plain text.
TapMeasure - Smart Augmented Reality Measurement
NimbleText - NimbleText is a text manipulation and code generation tool available online or as a free download.