The LoopTools add-on is a script containing a collection of tools to aid mesh modelling in Blender including new mesh modeling tools as Bridge
Circle, Curve, Flatten, Loft, Relax, and Space. For more information on the LoopTools mesh modeling add-on for Blender 3D, check out the documentation here – or download LoopTools for Blender 3D here.

LoopTools for Blender from Bart Crouch on Vimeo.

LoopTools is a script providing new modelling tools in Blender. This script originally started as just a Curve tool, inspired by this thread. What followed were several versions of LoopTools for Blender 2.4x. You can find the last one of them here.