Delphi is still very much with us, but the FOSS world also has its own, largely compatible, GUI-based Object Pascal environment – and it's worth a look.

This list is a work in progress. I'm sure I'm missing many great projects. Feel free to send a pull request (just make sure it has a contribution/donation/both link ...

Note - We don't curate individual distros ourselves as we feel the indexes listed are good enough to stand on their own.