Downloading Photonium 1.0.1 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The application belongs to Productivity Tools.
From the developer:
You have photos.
Maybe they're new, maybe they're old. Maybe you took them with your phone, maybe you took them with a digital camera, maybe you scanned them in. No matter where they came from, you put all of them into Photos. And now you want them out.
You want them on the web.
Photos.app lets you share with Facebook and Twitter and LinkedIn, sure. But Pinterest? Ebay? Amazon Prints? Etsy? Craigslist? Wordpress? Shutterfly? Not so much.
You may want to check out more software for Mac, such as BigCloud Archives, Everport - for moving 37signals' Backpack data to Evernote or MapMan, which might be similar to Photonium.