On mac I would use Elastics (http://tundrabot.com/elastics) To kind of, monitor my EC2 instances. Most important to me was that it worked across several accounts and that it allowed me to connect to a running instance via ssh or RDP.
This was the only real feature I care about. I can not always keep the IP address of the server that is running because ec2 is elastic, and it changes frequently.
Is there any tool, like Elastics for linux/unity? Again it should support several accounts and be able to give me the IP addresses of the instance I select.