Some time ago, I did a search for such programs and came up with yet another one, from a competing translation service company, Advanced International Translations.
AnyCount 6.0 does the counting, without the invoicing tools. One must add each file separately; one cannot add folders themselves. The results carry some additional detail -- for example, footnotes and endnotes are counted and reported separately, a feature certain to be useful to some writers. The software is not cheap, costing 49 Euros. The company offers a lite version called ClipCount for 12 Euros, but it only counts words cut onto the clipboard. The same company apparently provides another version, called AnyMaxi, which does include the invoicing component, perhaps useful for ghostwriters and free-lancers who are paid by the word.
These three are available at different websites [which similar design]: