I've been using IPSecuritas to connect to two different Juniper SSG-140 routers/security-devices (Melbourne office and Sydney office). IPSecuritas works beautifully. I was considering Equinux's "VPN Tracker" (expensive) but IPSecuritas does everything I need to do and for free!

The setup wizard works well and configures most of the settings required for my Juniper SSG-140 devices.

I found the Equinux documentation on configuring the Juniper SSG-140 helpful. The Equinux documentation goes into a bit more detail on setting up Extended Authentication (XAUTH) on the SSG-140. IPSecuritas supports Extended Authentication (XAUTH) nicely.