Here's a fun exercise. All LISPs named after divisional metric prefixes.
decilisp - Does not exist
centilisp - Does not exist
millilisp - Abandoned
microlisp - AVR/ARM only. No hardware access. http://www.ulisp.com
nanolisp - Abandoned
picolisp - https://picolisp.com
femtolisp - Abandoned
attolisp - Abandoned
zepto - Abandoned
yocto - Abandoned