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.
Micoo : Micoo is a pixel based screenshots comparison solution for visual regression test
Bridgy : Bridgy pulls comments, likes, and reshares on social networks back to your web site. You can also use it to post to social networks - or comment, like...
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.