Heytools - JavaScript tools, AJAX tools and some fully server side tools.
Sublime Text - Sublime Text is a sophisticated text editor for code, html and prose - any kind of text file. You'll love the slick user interface and extraordinary features. Fully customizable with macros, and syntax highlighting for most major languages.
WordCounter.net - Count words, sentences, paragraphs etc.
The up-goer five text editor - A tool to track your use of the top 1000 most popular words
TextBuddy for macOS - A Swiss Army knife for plain text.
Left - A minimalist multi-platform text editor