Microsoft             Linux
     ---------             -----
 
     Microsoft Word        Openoffice

     Notepad               gvim, gedit, others...

     Java                  Java, Python, C, Php, Lisp, Prolog, Fortran, ... any language there is
      
     Photoshop             Gimp

     PCGrasp               JGrasp
  
     XP                    Fluxbox, Gnome, many more...