Hey there, I realize I'm hopping onto this thread a bit late, and the topic seems to be around frameworks, 3d and other such stuff ... so I just wanted to acknowledge my awareness at that (so I don't get yelled at ..

) and just step back to the original post ..
One thing I'd like to see, is one that does NOT force the use of a grid, having circular templates and measuring ranges and distances in straight lines. (instead allowing movement like using a tape measure in warhammer, and cones shaped line cones, instead of cones shaped like cones approximated into squares).
I know these two don't have that. Are there any that do?
Even without that feature. What sort of virtual tabletops do you guys use?
I'm surprised nobody else mentioned this already (if they did, I missed it), but we use Gametable (sourceforge.net), it's free, open source, and allows Square or Hex grid, as well as No grid, allowing free placement of pogs ala Warhammer. It's got your measuring tape, line drawing capabilities, ability to create your own pog/environment/underlay/overlay/etc allowing you to create cones in whatever shape/size you want ...
We're playing 3.5 D&D with it, and I had my friend create a 2-color pog (smaller size) to show light radius (30', 60' and 120'), makes things really easier on DM as he can quickly spot how far each character can see given the current light source ...
So far, I'm pretty impressed with it's rich features and abilities considering open source / free software ...
I'd highly recommend you taking a look at it if you haven't yet ...