[badsectoracula]

Here: https://www.lazarus-ide.org/

It is basically open source and cross platform Delphi (there are a bunch of differences but from a high level perspective i think that it describes it fine for people who already know Delphi).

Also check this video i made a few years ago[0] making a simple puzzle game in Lazarus. You can skip to 11:30 if you don't care about downloading, compiling and configuring it and just want to see it in action.

[0] https://www.youtube.com/watch?v=s_01Xhd2EJM