UV_Toolkit
by thomthom
UV mapping automation:
tries to fit the texture of the current material onto all quad-faces in the selection. The texture should fit once across the face, no tiling.
Rotates the orientation of the textures on the quad-face,
Transfers the material from one side of the face to the other. UV mapping will be mirrored.
UVtools
by D. Martens
Sections: Edit ; Materials - Rendering
Cylindrical and spherical mapping on surfaces.
UV Projection
by J. Sandstrom
Can easily fix messed up UV's by projecting planar UVs on a selection in either X, Y or Z axis.
Cylindrical UVtools may work best