TexturePacker - Texture Packer is hands down the best sprite sheet generation tool on the market.
Bulk Image Downloader - With Bulk Image Downloader you can download full sized images from almost any web gallery.
ShoeBox - Free unlimited photo storage, so you can rediscover your photos anywhere. Available for iPhone, iPad, Android, Mac and PC.
Vov Picture Downloader - Download pictures from websites.
Free Texture Packer - Free Texture Packer is an open source tool that allows you to pack multiple images into one atlas for you games or sites.
WFDownloader App - A free bulk image downloader application that also serves as a multi-purpose bulk downloader for your PC.