Free Video Flip and Rotate is a Free software that as it's name suggests can be used to rotate a video or flip a video clip vertically, horizontally, 90 or 180 degrees clockwise or counterclockwise. Rotated Video files can then be converted into MP4 format and played back using your favorite video player.
X2X Free Video Flip and Rotate Software
Authors Website: x2xsoft.com/productlist/fliprotate.html
License: Freeware
It appears the author has abandoned this software!