http://www.polyboost.com
plz check the demo, for example: http://hem.bredband.net/polyboost/PolyBoost1_5_upgrade.avi
It’s interesting, perhaps we should suggest a few of those features to the Blender foundation. However, we allready have most of them.
oh there are few i would love to have in here!
the loop remove or loop adjust things among the other loop tools.
procedual topology
the paint connect wich enables to subdiv only one face without
creating a mess to connected faces.
the rest are nice but i ask myself how often you will be able to use them!