SOOP Raven is a robust online tool. The feature list itself suggests the power of this interface. Each feature seems to be developed at a pretty sophisticated level. It is customizable beyond my expectations, and the support has been great.
If you know enough to be able to follow the instructions in setting up the database ID on the server (yourself or with your server admin), you should find a lot at your fingertips in no time.
Compares VERY favorably to other open source portal tools.