1. Gist.io (.md files) gist.github.com/username/id --> gist.io/@username/id 2. bl.ocks.org (.html .css files) gist.github.com/username/id --> bl.ocks.org/username/id #3. gist.run jsfiddle, plunker, gist import. run .html , .css , .js for testing and saving