SciTE is one of the IDE’s available under Freeware category in the market for PHP/ASP/Ruby/++ scripting. I have used that as an example to answer the above question.
Once the software is downloaded and configured in your system, you might want to create a shortcut for that application in the desktop. Creating a symbolic link would help you in that.[root@user Desktop]# ln -s /usr/local/bin/SciTE $HOME/Desktop/scite
i.e.[root@user Desktop]# ln -s [path-to-executable-file] [TARGET-location-where-shortcut-is-to-be-created]