It was mentioned in a different article on HN the other day a Professor somewhere who still swore by an old CD of Microsoft Bookshelf [1]. That Professor believed that the American Heritage Dictionary, 3rd Edition included in Bookshelf remains one of the best dictionaries ever assembled. Bookshelf CDs also included Roget's Thesaurus.

[1] https://en.wikipedia.org/wiki/Microsoft_Bookshelf