Racket and #lang are a pretty good start.<p><a href="http:&#x2F;&#x2F;www.ccs.neu.edu&#x2F;home&#x2F;matthias&#x2F;manifesto&#x2F;sec_pl-pl.html" rel="nofollow">http:&#x2F;&#x2F;www.ccs.neu.edu&#x2F;home&#x2F;matthias&#x2F;manifesto&#x2F;sec_pl-pl.htm...</a>