krrp was written by Jonathan Frech, 2018 to 2019. It is a functional, interpreted and dynamic language which is designed to be cryptic, yet usable. Its Wiki can be found here.
As of the 24th of April 2019, krrp is kindly included in the TIO language collection, making krrp interpretation available from within the web. Great thanks go out to TIO for providing this service.
krrp is entirely written in pure C. Apart from recompressing the krrp standard library, only a C compiler is required for building; view the Makefile for specifics.
make should build the entire language,
make stdlib (requiring Python 3 to be installed) should also recompress the standard library.
Exemplary prime predicate
As a language appetizer, an implementation of the prime predicate follows.