[daros]

www.vizup.com

pro
1) the fastest OGL i ever seen.
2) very smart workflow.
3) opens and reduces 4000+ K meshes.
4) very-very stable.

contra
1) import only STL and VRML
2) do not mantains layer information in VRML format
3) you need to optimize each layer in a separate session.

With two more imlementations this is the best polygon reduction tool i found

[Leonardo]

...and Daros always knows what he's talking about

[x_site]

i've also read good reviews about this one but never had the chance to try it... i will now

[daros]

memory usage during 4 million polygon reduction: 550 MB
today, after my bug report, they fixed the layer issue and sended to me the working version!