Heytools - JavaScript tools, AJAX tools and some fully server side tools.
How Long to Read - Find out how long will it take you to read that book
WordCounter.net - Count words, sentences, paragraphs etc.
Weglot - Translate your website instantly, no code required
Word Count Tools - The must-have free word counter that provides an extensive report about the word count, character count, keyword density, readability & many other useful stats.
Wordcounter for Google Docs - A real-time word count and milestone markers in Google Docs.