GCloud platform provides additional development tools which are accessible with GCloud platform credentials.
You can see all these services available in bottom part of leftside menu. (Img. 1)
Mentioned services are enabled by default, but you can manage them from "Settings" -> "Online Services" section shown in Img. 2
Please, pay attention to monthly payment for all services (see Img. 3). If you don't need to used mentioned services and don't want to be charged for them, you can disable online services at any time as shown in Img. 3
When online services are disabled manually, or automatically due to lack of deposit, you will not have access to these services and if you try to click on any of these services you'll get the following message as show in Img. 4