Dr. Rob Waring and Dr. Charles Browne created a free text analysis tool known as the OGTE (Online Graded Text Editor) which allows you to simplify and analyze texts using a variety of corpus-derviced word lists. The NGSL, NAWL, BSL and TSL lists are all available on the OGTE and can be selected by using the pulldown menu on the left to select the NGSL plus one of our special purpose lists (NAWL, TSL or BSL). The OGTE tool also can be used with the original GSL/AWL as well as the ERF Scale. The OGTE tool can be found here.