Not productively. I'm not sure that you can open them at all on *NIX. .egp files are really just WinZip files with a different extension. The task logs are easy enough to read on a PC (though the names are uninformative). RTF output can't be directly interpreted.
Because an EG project is just a .zip file, any program in your unix environment that can read or extract a zip file will be able to understand a .egp file. Although a lot of the contents won't be usable (e.g. RTF output), the actual SAS code that forms part of the project will be in the contents as a regular ascii file. You can easily pull the code out and drop it into your Display Manager session in unix.
I've done this a ton, because people send me projects developed under different releases of EG, and sometimes it's hard for me to get at the correct version, so I can at least look at the parts of the file.