Wikipedia:

Integrated Development Environment | Web IDE | Comparison of integrated development environments 

IDE is a programming environment for writing code.  IDEs are useful for integrating different programs in a given programming language.

Visual IDE | Visual programming | List of rapid application development tools | Cloud Based RAD Tools | Web Based RAD Tools | Facade pattern 

Visual programming lets users create programs graphically rather than textually.

Notes:
 

"Visual IDEs allow users to create new applications by moving programming, building blocks, or code nodes to create flowcharts or structure diagrams that are then compiled or interpreted."

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Visual IDE:

280atlas.com .. a visual development tool for building applications in Cappuccino (application development framework) .. by @280north .. {related:} {topsy}

gnavi.org .. open source alternative to visual software development languages like Delphi and Visual Basic .. {related:} {topsy}

lilyapp.org .. a browser-based, visual programming environment that lets people create programs graphically .. {related:} {topsy}

limnor.com .. a complete codeless visual programming system .. {related:} {topsy}

paxstudio.com .. an IDE which combines visual form designer, script editing and debugging facilities .. {related:} {topsy}

tersus.com .. a Visual Programming Platform for creating rich web and mobile applications .. {related:} {topsy}

tigabyte.com .. an easy to use software creation system .. {related:} {topsy}

sourceforge.net/projects/visualtkinter .. Visual Tkinter IDE for Python, formerly pythonide .. {related:} {topsy}

zkoss.org/product/zkstudio .. efficient way to develop Ajax applications .. {related:} {topsy}

Web IDE / Cloud IDE:

c9.io .. Javascript, Ruby, PHP etc .. @cloud9ide .. {topsy}

coderun.com .. ASP.NET, php and Ajax .. @CodeRun_buzz .. {topsy}

cloud-ide.com .. JavaScript, PHP, Java, Groovy, Ruby etc .. by @eXoPlatform .. {topsy}

heroku.com .. Ruby, Node.js, Clojure, Java, Python, and Scala (calling themselves a "cloud PaaS") .. @heroku .. {topsy}

neptunide.com .. full featured, cloud based IDE for PHP .. @neptunide .. {topsy}

srob.fr/blog/category/informatique/sride .. online PHP editor .. by @srobzz .. {topsy}