Synesketch is an artistic software library with synesthetic abilities, created by Uros Krcadinac. It is a Web's first free open-source textual emotion recognition and visualization engine – code that feels the words visually.More about project you can find at it's official wiki.
People use emoticons every day as the easiest and most interesting way to express their emotions, state, or action. But their use is limited for many reasons. Smiley Ontology is an ontology that aims to enable interchange of emoticons between different systems, without any loss of their semantics, as well as to allow for captureing and formal representation of semantics of emotions and emotional states that are widely spread across the Web. For more information visit SO official