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.

The Urban Lightscape photo tool lets you adjust local brightness levels within an image, thus turning a simple snapshot into a real eye-catcher.

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.

The openArtist Ubuntu derivative is geared toward artists and other creative types; however, it should also be interesting to conventional users.

GIMP adds texture and other three-dimensional effects to images through the use of secondary maps that affect the original image on a per-pixel basis.

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.

View Your Mind lets you draw and manage mind maps that can help you structure your thoughts and ideas and record notes.

Darktable shines as the most powerful free RAW converter, with impressive new features in the current version 1.2.

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.