4. JS Nice
6. Js Bin
7. Kinetic Wing
KineticWing is a free IDE that is lightweight, portable and works on all major operating systems (Mac support is mentioned to be coming soon). It is not a complicated IDE but more like a smart text editor with modern features. These features include support for Sass or Less (with built-in compiler), HTML5-CSS3 or CoffeeScript.
8. Code Mirror
10. Net Beans
11. Cloud 9
12. Komodo Edit
13. JS Fiddle
14. Sublime Text
This is one of the most popular code editor, but it’s not entirely free: You can download and try it for free, but it will cost you $70 to continue using it, a price plenty of developers are willing to pay because of how useful and awesome it is.
CodePen is a playground for the front end side of the web. It’s all about inspiration, education, and sharing. The service highlights popular demonstrations (“Pens”) and offers advanced functionality such as sharing and embedding. Need to build a reduced test case to demonstrate and figure out a bug? CodePen is great for that.
Eclipse is a free, state-of-the-art Java development environment (there are also JS, PHP and C/C++ versions). It has a very active community and many open source plugins + developer tools built around the ecosystem.
It offers some nice collaboration tools along the way. It’s definitely one of the nicest development environments I’ve seen, as far as the style goes. You’re given a free virtual machine when you signup, to aid you with your development journey
Notepad++ is an advanced free text editor and a must-have for every developer using Windows. It has syntax highlighters for every popular scripting language and it is usually a perfect fit for a 2nd IDE, for small updates or simpler codes (however, there are many developers who only use it).