itch.io

Pretty good -- functionally, actually works great! Swapping between the disks, you can easily find thousands of words. There is no search interface, which would be ideal, but it's nonetheless east to look up the definition for any words you want. The biggest weakness here is that despite such a large word list, some of the definitions are lacking and downright nonsensical. A "psychic" is defined as an "Alt. of psychical" while a "dinosaur" is defined as an "Alt. of dinosaurian." In turn, a "dinosaurian" is "one of the dinosauria"; although that does not actually have a definition. With an updated word list this would be a super amazing app!