There are some individually maintained lists for some Scrabble dictionaries, and some websites for looking up words in those dictionaries:
- SOWPODS list: https://raw.github.com/jmlewis/valett/master/scrabble/sowpods.txt
- TWL list (and sublists): http://kisa.ca/scrabble/
- SOWPODS/TWL lookup: http://www.scrabblist.com/
However, collecting these and trying to make sense of the varying forms of data is difficult. OSPD, the only official dictionary, is copyrighted (see comments) so there is not likely a reasonable or legal source for this information.
Are there databases or APIs which allow querying of word lists from SOWPODS or TWL/OWL? Better yet, is there a unified source which allows querying specific dictionaries (or all dictionaries) based on a parameter?
English is the primary language of interest, but APIs providing other languages would be helpful as well.