We had few queries on Solaris Monitoring in our support. We do monitor CPU, Memory, Disk utilization of solaris out of the box.
Refer http://manageengine.adventnet.com/products/applications_manager/solaris-monitoring.html
We have Applications Manager downloads for Windows and Linux only. You can install AppMgr in a windows/linux machine and configure it to monitor the solaris machines in the network.
We currently do not have a solaris version of Applications Manager