JSitor - Test your NodeJS, JavaScript, CSS, HTML online with JSitor code editor.
MIT License - A license from the Massachusetts Institute of Technology.
JS Bin - Sample of the bin:
Simplified BSD License - Also known as the "2-clause" BSD license, this is a simplified version of an open source license created at the University of California Berkley.
CodePen - A front end web development playground.
GPLv2 - Created for the GNU project, the GNU General Public License version 2 is the most popular free software license.