Here is the latest roundup of what has been updated or released recently:

BusyRay is a new freeware renderer for 3ds max 5 and 6
nPower Software have released Power CatiaToMax for direct import of CATIA 4 files
Next Limit released an update for RealFlow
David Gohara updated his sciAnaComp plugin, making all Photoshop blending modes available in a max material
3D Aliens released another update for glu3D
Chaos Group unveiled a stand-alone version of their V-Ray renderer with support for max and Maya

(continued...)