Javascript Develop Editor

Eclipse

  • Aptana
  • JSEclipse(Flex3 Plugin)

Microsoft

  • Visual Web Developer

Adobe

  • Dreamweaver CS4

Independent Javascript online develop

  • Opensource Brackets(Adobe)

http://blog.brackets.io/
Reference: (Japanese)
http://builder.japan.zdnet.com/html-css/35018972/

Pure javascript online develop editor

  • Liveweave

http://liveweave.com
Reference: (Japanese)
http://www.chrome-life.com/html5/5447/