A small note about your "BeOS" screenshot
That screenshot you have of "BeOS" is in fact a screenshot of Haiku, an OS inspired by BeOS that seeks to improve what BeOS had. It is working toward binary compatibility with BeOS R5 for its first release R1. It already has this compatibility and can run most BeOS programs. After R1 compatibility will likely be broken to fix some problems and to allow for moving forward.
There have already been two alpha releases, you can get the latest at http://www.haiku-os.org/get-haiku however be sure to read http://dev.haiku-os.org/wiki/R1/Alpha2/ReleaseAddendum as some things did not work out perfectly as happens with software.