Hugin Open Source Panoramic Image Stitcher

Hugin is an Open Source, Cross-Platform application to create seamless panoramic images by stitching. A free and open alternative to RealVIZ Stitcher (now bought by Autodesk).

Go to and download the precompiled application (OSX, Linux, Windows) or the sources if you know what you are doing.

Added: You can also use if for the correction of perspective, removal of distortion. It can call some external tools for automatic stitching (autopano) and automatic blending (enblend).