This looks amazingly comprehensive and high quality for a non mainstream language. I wonder how difficult it would be to get something like Rust, Nim, D or Crystal to be able to call the FreePascal ABI and link with this.
Lots of "famous" software has been written in Object-Pascal: https://jonlennartaasenden.wordpress.com/2014/11/06/famous-s...
(And yeah I did - I liked it too!)
I haven't seen Delphi feature in the top ten in any other language index so the TIOBE ranking seems to be an outlier, which is a shame because Object Pascal is a nice language.
For those of us into it, C wasn't never a thing neither we could get the famous rant from Kernighan about the language, as no serious Pascal developer would use the bare bones original ISO standard, just like most C devs never used pure K&R C back then.
Not sure if it's the same thing, but I found this: http://wiki.freepascal.org/Python4Delphi
That was to address if it's possible or easy to interface with Object Pascal. No idea about the languages you mention.
https://github.com/BBasile/Coedit
It reuses the Lazarus code editor and other things I am sure. I'm not entirely familiar with language constructs of D, specifically reflection (RTTI in Lazarus) and properties/events which are the magical glue that makes Lazarus work the way it does.
In comparison, Lazarus + LCL + packages is 1.59M SLOC while Coedit barely reaches 30K SLOC.
Coedit is really a simple program, it's just an editor dedicated to D, with facilities to compile projects (DUB, DMD-based custom format) and also to run D modules from scratch, it's just a GUI with a lot of piped sub-processes under the hood ^^