Free utilities for a power users switching from Windows to OS X? Possible Duplicate:
  OS X Applications you can&#39;t live without  




I'm looking for usual tools, like messenger, file transfer, text editor and so on.

PS. I would make it community wiki, but I do not see the option?!
Adium for instant messaging, it also has a nice menu icon. If you used Pidjin on Windows, this is the OS X alternative.