Comment by dzaima

In BQN, I've made https://codeberg.org/dzaima/bqn-smt/ (SMT engine bindings, plus various utilities, and a RISC-V & x86 superoptimizer of varying amounts of completeness); ~4KLoC (+1KLoC of tests). Might not fit your "real-world" as I am mostly its only user (and many things are undocumented), but it does have a good amount of non-trivial things aren't necessarily particularly array-y.

Can also look through APL github repos: http://github.com/search?q=language%3Aapl&type=repositories