As IDE was taken down and from what I read there are no plans to re-release it anytime soon, what are some editors that could work with cocos2d-X JS with IntelliSense, auto-complete… etc. ?
Personally I’m new to the whole cocos ecosystem and I just downloaded it today. I will be developing for IOS & Android
For web development you can use this , free out of the box javascript debugger support.
i wish they release the IDE source so we can continue develop it
Yeah, I forgot to mention I will be developing for IOS & Android 
I have used webstorm as the IDE to code game 
See more at : http://www.cocos2d-x.org/docs/tutorial/framework/html5/parkour-game-with-javascript-v3.0/chapter1/en