Zopim

As what the title implies, one of the best part about this tool is that is has an influential live chat which is really powerful. Also, the features are user friendly and ease of use is considered. Moreover, you can search the history of the chat which can be one of its best part.

ZOPIM does not automatically goes idle when you are far away from the chat or when you are busy or active from another application. For an instance, it should change its color when you are away or busy. That is why one of its cons is that you have to do it manually.

Overall feedback about ZOPIM is satisfactory. This is recommended for small to middle size companies who likes to have a live chat. I heard that they are adding new features which can maybe match your options on what software you are looking for. Try out the software and see it for yourself.