Nortel has ported site manager to solaris, hpux and and AIX, but I haven't seen any linux ports. If you can get the source code you might be able to port it to linux yourself, but I'm suspecting you'll have a hard time getting a hold of the source code.
Try to install Site Manger for windows using wine (the linux win32 emulator). I think that might be your best shot. Please post a note here if sm works under wine.
best regards
Katamann@hotmail.com