This demo helperApp for crossword puzzles for Tactile's xWord Buddy (xWB) may work with some xWB 1.x versions; xWB 2.1 has NetHopper & Newt's Cape plugins; however, these do not seem to work (and modifying this helperApp was also unsuccessful).
Make sure Newt's Cape:i:General:NewtonScript preference is set to Compile before loading page. If you tap Install, any crossword puzzles in Across format -- typically .puz, with MIME type application/x-crossword or application/across -- from the web should be added to xWord Buddy.
Some sample free .puz:
© Copyright 1997-2018, S. Weyer, G. Simon. All Rights Reserved Worldwide