Panoramic photo stitching software Instant Pano is a free application which can be used for stitching 360 degree cylindrical panoramas from any digital photos. You can take different photos with your normal digital camera and then stitch it together to form a 360 degree panoramic image. Instant Pano supports importing the single row of images taken with a common camera from the same viewpoint; stitching cylindrical panoramas; preview of the cylindrical panoramic images.
To stitch a 360 degree panoramic image, the number of shots required for stitching varies with different cameras and lens. Instant Pano has provided a tool for calculating number of shots needed, you can refer to instructions available on the website on how to get started.
Instant Pano is a useful free tool for stitching photos.