write and run a code on a browser...
Online web client-side source code playgrounds:
open 4 maps Google/Yahoo!/Bing/OpenStreetMap
with api Flickr
(Plunker is an online community for creating, collaborating on and sharing your web development ideas. and it's fully open-source on GitHub).
Bootstrap is the most popular HTML, CSS, and JS framework in the world for building responsive, mobile-first projects on the web.