Ztitch - Ztitch is a freemium standalone panorama viewer and maker that allow you to create beautiful 3D scenes and share them with your friends.
digiKam - Professional Photo Management with the Power of Open Source
Mosaicker - Information about Mosaicker iPhone app
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
DMD Panorama - HD 360 Panoramic Camera In A Snap
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.