Commento : A lightweight, open source, tracking-free comment engine alternative to Disqus.
Carbon : Create and share beautiful images of your source code.
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Multicolr Search Lab : We extracted the colors from 20 million Creative Commons images on Flickr to make the images searchable by color.
Caire : Caire is a content aware image resize library
MyOSMatic : This is a free software web service that allows you to generate maps of cities using OpenStreetMap data. The generated maps are available in PNG, PDF ...
Looks good to me (LGTM) is the most popular comment on Github, perhaps. But LGTM is boring. So we spice it up with some images.