Missing: Microsoft Bookshelf [1]. Encarta was a somewhat similar product, but the reference sources in Bookshelf were arguably better. For example, Bookshelf contained the unabridged American Heritage Dictionary, while Encarta used (I think) a Webster's dictionary [2].
I still use Bookshelf 1996 on most days of the week.
[1] https://en.wikipedia.org/wiki/Microsoft_Bookshelf
[2] https://en.wikipedia.org/wiki/Encarta_Webster%27s_Dictionary