You can find the technology using recon tools but I am sure you want to do it in a different way only by the information found about the web application files. To answer your question, if you have found the files in these directories, then you can know the technology from the file extension. But if the directory name is all you got, then look for common directories of technology. For example:
- servlet — Java servlets
- pls — Oracle Application Server PL/SQL gateway
- cfdocs or cfide — Cold Fusion
- SilverStream — The SilverStream web server
- WebObjects or {function}.woa — Apple WebObjects
- rails — Ruby on Rails
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