If you are only looking at viewing, there is The Krit's override add-on, but that hasn't made its way to the new vault. NWN Explorer should have the files though they might be difficult to read as there are multiple 2da references by row number. Summons are pretty much all nw_s_*, x0_s_*, x2_s_*. Check the NWN wiki for the creatures you wish to view. I believe the wiki does have all of these summons, polymorphs, companions, and familiars documented with fairly complete stats.
I'll see if Rolo can expedite The_Krit's add-on which could be used locally.
Thanks for noting the prefix conventions for summons, WhiZard. Using the nudge I've found the other non-paletted forms once I could recognize the abbreviations. Now all that is left is locating where all the indexes are referenced and I should be good to go. I'd like to export the arrays into spread sheet form for manipulation, comparisons, sorting, filtering, etc. without all the cut 'n pasting which is characteristic of grabbing data from formatted pages. I'm sure the wiki can help me figure out how the data is interlaced and x-indexed.