More tools like jsbin

I am very excited about great online tools for creating and previewing code online interactively like you can in jsbin.

I came across more tools like this. I haven’t tried them all but they look interesting:

http://codepen.io

http://cssdesk.com

http://dabblet.com

http://jsfiddle.net

http://jsbin.com

http://tinkerbin.com/
no longer working

http://tinker.io/
no longer working
Do you have any suggestions or comments about these or other tools?