Submitter/site creator here. The thing is it's Free Pascal, a fully object oriented version of Pascal geared up for visual applications. Language features include intrinsic events types (delegates in C#), run time type information (what makes live components possible), managed types (such as string, array, interface, and variant types), generics, operator overloading, implicit/explicit type convert plus a whole lot more.
That and it's based off Turbo Pascal and Delphi (it supports the full D7 dialect and many of the newer Delphi features as well). As such people have created a wonderful cross platform OS and widget set agnostic visual library called the LCL.