Juniper VPN Client

I read some topics where people speak about a VPN Client for MacOSX from Juniper, but I don't find anything about it on juniper website.
My issue is that my company don't give me the pre-shared key, in this way is impossible to use standard VPN client software like VPN Tracker, so I'm able to connect only with windows client using the .spd file provided by my IT services.
Someone can help me? Otherone had a similar issue?
Thanks in advance and sorry for my bad english