LKML.ORG - the Linux Kernel Mailing List Archive.
Youglish - Use YouTube to improve your English pronunciation.
txti - Fast web pages for everybody.
testmysite.io - Testmysite.io rates your site based on its initial global load times and its security settings.
Git.io - Official GitHub link shortener.
Sketchysite - You can trust this.
Emojipedia - Emojipedia
Webframe - Beautiful Screenshots showing webapp designs.
Spreadsheet Converter - Things to Make and Do in the Fourth Dimension
The Numberphile Podcast - Brady Haran.