Cluster - A beautiful and easy way to collect and view inspiration
digiKam - Professional Photo Management with the Power of Open Source
Notabli for the Web - Childhood, privately shared & effortlessly organized
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
Flashgap - Time-delayed photo-sharing app of last night's embarrassment
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.