Heytools - JavaScript tools, AJAX tools and some fully server side tools.
Fonts In Use - Type in the real world: an amazing archive of typography.
WordCounter.net - Count words, sentences, paragraphs etc.
Typewolf - Typewolf helps designers choose the perfect font combination for their next design project—features web fonts in the wild, font recommendations and learning resources.
TextBuddy for macOS - A Swiss Army knife for plain text.
Google Fonts - Making the web more beautiful, fast, and open through great typography