GIMPx.ru
The About command shows the About window, which displays information about the version of The GIMP you are running and the many authors who wrote it.
You can access this command in the image menu through Help ? About
Figure 15.210. The “About” dialog window
The Credits leads to the list of contributors to GIMP program, concerning programming, graphics and translation of the interface.
The Licence explains how to get the licence.