toblotron

We use it a lot - we receive requests of up to 5 M size of .Net structures, and just wade through all the strange class-relations with Prolog :)

I read that in 2014, 1/3 of all flight bookings in the word went through (Sicstus) Prolog.

It has its uses, and I like working in it :)

We use Sicstus Prolog, which we connect to .Net by a provided set of interface-classes

It also has a bi-directional interface to Java, but Sicstus is unfortunately neither free nor cheap