Let's say, I have one or more web app I find interesting, and as I want to do something similar, I would like to know on which technology they are based (programming language, database, web server, framework, ...).Is there any site where such information is centralized? If not, where should I look for this information?
Where should I look to know which technology is used in a web app?
web development;configuration
If it is a plugin based web app like an RIA (Rich Internet Application) then it is fairly easy to identify a Flash plugin, Silverlight plugin or Java applet.Otherwise if you view page source you can often times get a number of helpful clues about what technologies are being used.  Looking at script references can tell you things like:ASP or ASP.NETJQueryYUIThird-party ASP.NET controls (Eg. Infragistics, Telerik, etc..)JSF and JSF2Third party JSF controls (Eg. Richfaces, Primefaces, etc...)Google API'sSometimes even urls for various public web services like Amazon or Google.You can gather an absurd amount of architecture clues just by View Source of a web page.