>>11
Little Wing Pinball uses Scheme as a scripting language: http://www.littlewingpinball.com/doc/en/ypsilon/index.html
Galactology used to embed s7 Scheme: http://carloscarrasco.com/a-love-letter-to-s7-scheme.html but they transitioned to LuaJIT and are using l2l for backward compatibility with Scheme scripts.