ParkMyCloud is described as ', a Turbonomic company, provides an easy-to-use platform that helps enterprises automatically identify and eliminate wasted cloud spend'. There are three alternatives to ParkMyCloud for Online / Web-based and Amazon Web Services. The best alternative is CloudRobo. It's not free, so if you're looking for a free alternative, you could try GorillaStack.
Manage your AWS cloud using GorillaStack's toolset. Take greater control over your billing and usage with Power Cycle, Power Scale and Alerts. Power Cycle - turn your EC2 instances on and off by schedule to avoid wastage.