Oookay... Back to the topic.
I got to admit that I didnt really tested everything here, just reading their related post on the entries.
I choose LBGUI as my favorite since it happens that I need something like that right now, and 3DGS is lacking those . If I can choose the second best, it will be Act!.
The LightFrog is looking good on the screen shot but it run at 8 FPS on my old PC(256Mb Radeon 9600) with some effects missing.