I really like most of the entries. I like the Particle Effect Builder, Hummel`s advanced lighting (looks unbelievable) and of course LBGUI for its usability the most. Act! is also very cool, but a little too buggy. FXED seems to be very professional, but I`m no shader coder. So my vote goes to: Particle Effect Builder (not the Particle Generator!). Because it`s the most useful tool for me and I waited for an advanced Lite-C particle tool for a long time.