One of the things I'm excited about, is using FPC/Lazarus as GUI for computationally heavy Go code (Now with the recent efforts to use Go for datascience ... see http://gopherdata.io), now since Go supports shared object (.so/.dll) files.

I collected my (very early) research on it in this thread:

https://forum.lazarus.freepascal.org/index.php?topic=24948.0

... where some users report they tried it already. Seems to work, if not super smooth. Hope it can be improved in the future.