With Hugin you can assemble a mosaic of photographs into a complete immersive panorama, stitch any series of overlapping pictures and much more.
Hugin 2013.0.0 is dreadful! It won't load images until you specify stuff like lens type, focal length, focal length multiplier, etc. and it won't progress from there. With my crude cameras I have no idea what that information might be. My PC is Windows 7 64 bit and runs Hugin 2010 beautifully, it works like a dream and asks none of that technical information. Ask around for a copy of Hugin 2010 and you'll be in business, it's great!