The image viewer Geeqie is used to view and sort image collections. The tool supports numerous formats, reads metadata, and – among other things – displays the location where you took the picture on a map.
The Guetzli image optimizer by Google developers produces smaller images than JPEG while maintaining the same quality, but it requires a powerful computer with a large working memory.
Sharing videos or images doesn't always require a full-fledged YouTube or Flickr clone. Sometimes all you want is a quick place to upload, so you can link to your media or share it online. MediaCrush gives you just that, as well as other interesting perks.
Instead of relying on a third-party service for instant photo sharing, you can build your own solution using existing software and a pinch of PHP and Python scripting.
Processing images with a high dynamic range – that is, an image with a wide range of values between its bright and dark areas – is possible with open source Luminance HDR.