It'd be really fun to simply type a logical question and directly see whether it is legal or illegal based on all the definitions.
https://www.doc.ic.ac.uk/~rak/papers/British%20Nationality%2...
Parts of the constitution of Japan in Prolog:
https://github.com/bitlaw-jp/the-constitution-of-japan
A recent project involving the formalization and automated analysis of criteria for grants:
https://www.brz.gv.at/en/BRZ-Tech-Blog/Tech-Blog-7-Symbolic-...