Hi skykrawler, welcome to PGD!

There are lots of SDKs (Software Development Kit) and APIs (Application Program Interface) that are made for or used by Pascal and Object Pascal. The forum sections below this one list some of the more popular ones.

Robert is right about the game engine being a seperate thing from the SDK or API. Usually most game engines use a few to several SDKs or APIs to run off of. Most if not all SDKs would be based off of a single API or more.

With time to explore and try out different ones you'll figure out which ones you like best and what each they have to offer. It takes a bit of time though.