I just found a tool called Insider on http://www.fourthelephant.com/ Just have a look at the screenshots on their site or download it. Gives a very cool overview of the status of your database. You can't compare it with GridControl but the graphical capabilities rock!
Some of the stuff I do for a living. This mainly concerns working with Oracle Databases and Application Servers. Lately I picked up AWS, Azure and OCI.