Lisp in Conway's Game of Life: https://github.com/woodrush/lisp-in-life
The implementation involves compiling a C implementation of lisp onto a custom CPU in Life, modified from one used four years ago to implement Tetris in Life (https://codegolf.stackexchange.com/questions/11880/build-a-working-game-of-tetris-in-conways-game-of-life/142673). It would be capable of running other C programs in the same way.
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