First of all, TSR went bankrupt nn 1999. The D&D brand was purchased by Wizards of the Coast.

Second, Wizards did not develop Neverwinter Nights, they sold the rights to a SOFTWARE COMPANY.

Third,

Mac OS X version

On August 21 2007, Macworld reported that Aspyr Media is currently working on a Mac OS X client for Neverwinter Nights 2.[14] It was noted that, like the Mac OS X version of the original Neverwinter Nights, it would come without the toolkit. Mac OS X owners will be able to play user-created modules made in Windows however.

It is currently scheduled for shipping on February 26, 2008.

Fouth, as of right now the D&D Digital stuff is Windows only, so you got one right.