The original data is in the public domain, as is the new lisp system.
The lisp library exports a single function,
grammar-of, which takes a string and returns a list of grammatical categories that the string is known to fall into (NIL if the string is an unknown word). For example:
<code> CL-USER> (beg:grammar-of "write") (:VERB) CL-USER> (beg:grammar-of "right") (:VERB :ADJECTIVE) CL-USER> (beg:grammar-of "wrote") (:PAST-PARTICIPLE :VERB) CL-USER> (beg:grammar-of "writer") (:NOUN) </code>
Basic-English-Grammar is ASDF-installable.