quest3d.com for an example: http://www.gamicalstudio.com/uk/index.php?option=com_content&task=view&id=42&Itemid=88 I've been using it as rapid prototype for years for 3d apps. Easy to use, but its a bit costly.
I'm not sure exactly what you guys are doing, but if you're looking to do real time 3d web applications the next version of Flash might be useful for you. The new version has Action Script 3.0, a new version of the flash scripting language, which grants Flash access to the GPU. This makes Flash able to do a lot more than…